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?

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.