Children of different ages and countries play computer games these days. Parents think these computer games have little educational value and have harmful effects on children. What is your opinion?
It appears that problem solving is missing a hyphen. Consider adding the hyphen(s).
It seems that article use may be incorrect here.
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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.