An increasing number of professionals such as doctors and teachers are leaving their poorer countries to work in developed countries. What are the causes? What solutions can you suggest to deal with this situation?
It appears that you are missing a comma or two with the interrupter as a result. Consider adding the comma(s).
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Use a variety of complex and simple sentences
You should use complex sentences in your writing, but it does not mean that you should try to make all of our sentences complex.
‘Complex’ sentences are not actually very complex; they are just two or more simple sentences put together. Putting them together makes the essay more coherent and cohesive.