Question

Read the sentences. Thomas Paine authored Common Sense, which argued for American Independence from Britain. Paine also wrote The Crisis. Which is the best way to combine these sentences?

Answer 1

The correct answer is:

A. Thomas Paine authored Common Sense, which argued for American Independence from Britain, and he also wrote The Crisis.

This is the best way to combine these sentences.

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Answer 2

I don't know whether you have any options, because you haven't given us any, but here is how I would combine these two sentences:
Thomas Paine authored The Crisis, as well as Common Sense, which argued for American Independence from Britain. 
Or you could just place the other sentence in the end:
Thomas Paine authored Common Sense, which argued for American Independence from Britain, and he also wrote The Crisis.