IELTS Writing- How To Write a Complex Sentence

What is a complex sentence?

The main problem here seems to be the word ‘complex’. Complex, in this situation, does not mean complicated, long or impressive. This is a common misconception and leads to students writing very long and grammatically incorrect sentences that are very difficult to understand.

For example:

‘In the modern world, global warming is one of the most popular topics causing many environmental difficulties and tough challenges arising from its serious consequences.’

This is a very typical sentence from an essay that is trying to be overly complex. This student has tried to put four simple ideas into one paragraph, resulting in an awkward and incoherent sentence. They have lost control of the grammar, and this affects the meaning. When meaning is affected, it stops the reading understanding of what is being said, and that isn’t good for your IELTS writing band scores.

‘Complex’ sentences are not very complex; they are just two or more simple sentences. Putting them together makes the essay more coherent and cohesive.

Let’s look at the first example again. In the sentence above, there are four simple ideas that we can put into simple sentences:

1. Global warming is a common topic these days.
2. Global warming causes environmental problems.
3. There are tough challenges associated with global warming.
4. Global warming has very serious consequences.

If we write all of our sentences in the IELTS exam like this, we lose marks because they are too simple. What we need to do is put them together to make complex sentences.

Complex Sentence Examples

For example:

One of the most common environmental issues is global warming which causes many serious environmental problems. Tough challenges are associated with this issue, and its effects have very serious consequences.

I don’t think there is anything ‘complex’ about these sentences, just simple ideas put together.

‘Complex’ is just a label, not a description.

I have taken each of the four simple sentences and put them together in two complex sentences. This result is a grammatically correct, easy-to-understand paragraph.

When should I use complex sentences?

Generally, we should use simple sentences when making main points, normally at the beginning of a paragraph. We should then use complex sentences when expanding on the main point, for instance, when giving a supporting example or explaining our main point.

Example:

This is a question about whether ‘fast food’ or ‘junk food’ should be taxed at a higher rate than normal food.

‘Increasing taxes would raise prices and lower consumption. Fast food companies would pass on these taxes to consumers in the form of higher prices, which would lead to people being unable to afford junk food. For instance, the cost of organic food has proven prohibitively expensive for most people. Despite this, people in many developed countries, where the problem is most acute, can afford price hikes and will continue to eat high-fat meals.’

The first sentence is the ‘topic sentence’ and makes the main point. It is, therefore, acceptable for this to be a simple sentence.

The second sentence explains the main point and uses the word ‘and’ to link two simple sentences together to make one complex sentence.

The third sentence gives an example and uses the linking phrase ‘for instance’. The final sentence makes a concession (shows the limitation of the argument) and is also a complex sentence, linking more than one idea together.

This paragraph has a mix of simple and complex sentences and therefore satisfies the marking criteria.

How do I make a complex sentence?

Remember that a complex sentence is more than one simple sentence to make one sentence. We, therefore, need to learn and become confident using the various grammatical structures that allow us to do that. Below are a few ways we can link ideas together in a sentence.

To make a complex sentence, we normally should have two things- a dependent clause and an independent clause. A clause is a group of words with both a subject and a verb.

An example of a dependent clause is ‘….because the weather was cold.’ This is a dependent clause because it has a subject and a verb but doesn’t make any sense. To make sense, we need to add an independent clause.

As the name suggests, an independent clause can make sense independently. For example, ‘I wore a warm coat.’ If we combine these two clauses, we get a complex sentence- ‘I wore a warm coat because the weather was cold.’

As you can see, ‘complex’ sentences don’t have to be complicated. Let’s now look at other ways we can make complex sentences.

1. Relative Clauses

You can use relative clauses to give essential or extra information about a person, place, or thing. This makes our writing more fluent and more coherent. We do this by using relative pronouns like who, which and that. For example, ‘He’s the kind of person who is always friendly.’

For example:

Air pollution can cause health problems. Air pollution is largely caused by motor vehicles.

We can convert these two simple sentences into one complex sentence by using the word ‘which’.

Air pollution, which is mostly caused by motor vehicles, can cause health problems.

For example:

There is evidence that some people are more likely to smoke. These people have parents and friends who smoke.

We can link both of these sentences together by using the word ‘who’.

Evidence shows that people with parents and friends who smoke are more likely to smoke.

2. Subordinate Clauses

A subordinate clause can describe nouns and pronouns; describe verbs, adverbs, and adjectives; or act as the subject or object of another clause. They connect an independent clause with a dependent clause with words like as, because, while, until, even though, although, when and if.

3. Conditional Clauses

Also known as ‘If clauses’, they are used to express that the action in the main clause can only take place if a certain condition is met.

For example:

If I had a million dollars, I would quit my job.

I will be really happy if I pass the IELTS test.

These clauses are good for giving examples in IELTS writing part 2.

For example:

‘Increasing taxes would raise prices and lower consumption. Fast food companies would pass on these taxes to consumers in the form of higher prices, which would lead to people being unable to afford junk food. If the cost of organic food proves prohibitively expensive for most people, they will not buy it. Despite this, people in many developed countries, where the problem is most acute, can afford price hikes and will continue to eat high-fat meals.’

They are also useful for discussing unreal situations or speculating about results in the past or present.

There are four different kinds of conditionals which I will outline below:

Zero Conditionals are used to talk about true information or facts. We can use if or when to introduce the conditional.

Example: Nowadays, when we travel long distances, we usually use air travel.

First conditionals are used to talk about things in the present or future.

Example: If the city’s population grows, we will need to build more infrastructure.

Second Conditionals are used to talk about impossible things.

Example: If the sun didn’t come up tomorrow, we wouldn’t have any life on earth.

Third Conditionals are used to speculate about past events. It is often used when we regret something or to imagine a past unreal situation.

Example: The Second World War would have never happened if Germany had been given a fairer peace settlement in World War One.

4. Compound Sentences

Compound sentences consist of two independent clauses linked together with a conjunction such as ‘and’, ‘for’ or ‘but’.

Examples:

I really want to study, but I’m too tired.
She got to the test centre early and did well on her IELTS test.

Some students think these sentences are too simple to count as complex, but they are wrong.

Warning

The crucial thing is to understand and be able to use these grammar structures before your IELTS test. Some students memorise many structures and try to insert them into their essays without considering how they work or if they are accurate. This will only lead to unnatural and incoherent sentences. Remember that your sentences must also be error-free, so only use structures you are confident using.

The key is to only use them appropriately. Concentrate on answering the question; if you know how to use these structures, they will flow naturally.

Next Steps

I hope this post has demonstrated that you can write your ideas down clearly and simply and still satisfy the marking criteria for complex sentences.

When you are practising IELTS writing questions, think of what you want to say in simple sentences and then think of how these might be linked into complex sentences. After enough practice, it will become a natural thing to do, and your writing will really improve.

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