Nowadays people tend to change a few careers during life. What are the reasons for this, in your opinion? Do you think it is good for the society as a whole?
It seems that mind may not agree in number with other words in this phrase.
It appears that the singular demonstrative this is modifying the plural noun employers. Consider using a plural demonstrative or a singular noun instead.
It appears that you are missing a comma after the introductory phrase after a while. Consider adding a comma.
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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.