You've been asked to do a presentation and will need help setting up the equipment for it. Write a letter to your colleague. In your letter let him/her know when and where the presentation will take place tell him/her what equipment you will need explain how he/she can help you.
The noun phrase social environment seems to be missing a determiner before it. Consider adding an article.
It seems that there is an article usage problem 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.