Combining Sentences: Compounding Whole Sentences
Just as similar sentence parts may be compounded, whole sentences also may be compounded.
Remember that subjects may be compounded with other subjects, modifiers with other modifiers, and so on. In the same way, one whole sentence may be compounded with another whole sentence by a conjunction (and, but, yet, or, nor). When you are compounding whole sentences, two other conjunctions come into play: for and so. When you compound whole sentences, a comma before the conjunction marks the place where one clause ends and the next begins. When more than two sentences are compounded, the conjunction usually appears between only the last two, while the others are separated by commas.