Learner chooses the structure they can control, and knows when reaching for a complex sentence lowers the band.
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Six pairs. Most people pick the longer one.
A: Although the fees are high but many student still applies because they want a good job in the future. B: The fees are high. Many students still apply, because they want good jobs. Which scores higher?
What the descriptor says, why it happens, and what this is not.
At Band 5, complex sentences tend to be less accurate than simple sentences.
The examiner is reading for accuracy at this band.
A broken complex sentence scores below two clean simple ones carrying the same content.
Where accuracy starts to fall away, and where you stand now.

The line moves. It moves by being practised, not by being ignored.
Eight sentences. Two are correct and stay whole.
Although the fees are high but many student still applies because they want a good job. →
Because the traffic was very bad in the morning so I decided that I will leave earlier. →
Although it is expensive, many people buy it. →
The report which was written in June by the committee who studied the problem for two year recommend closure. →
If the government will reduce the fees, more student from poor family will be able to attend. →
Because the buses are free, more people use them. →
Many people believes that the government should spend more money on the public transport which is used by everyone in the city every day. →
When I arrived at the office which is located in the city centre I sees that nobody was there yet. →
One idea, two versions, and say which you would submit.
Idea: free public transport would cost a great deal, and most cities would still be better off with it.
Version 1: one complex sentence. Version 2: two simple sentences carrying the same content. Then: say which one you would actually submit in an exam, and why.
Be honest in the third box. The right answer is not always version 1.
Use a joining word.
Same content.
One or two sentences.
At what length did your sentence start to go wrong?