Five Sentence Combining Options

Option 4: Simple Sentence + Key Word + Simple Sentence

after, although, as (as if) because, before, if, since, unless, until, when (whenever), whereas, while

Option 1: Simple Sentence + Comma + Key Word + Simple Sentence

and, but, for, nor, or, so, yet.

Option 3: Simple Sentence + Semicolon + Key Word + Comma + Simple Sentence

consequently, furthermore, however, indeed, in fact, moreover, nevertheless, then, therefore