Complex sentence: The employees force Michael to tell which one, and Stanley becomes worried, but just as Michael is about to announce the true rumor, Jim announces that Pam is actually pregnant to prevent Michael from saying the "wrong" rumor.
Split into simpler sentences: The employees force Michael to tell them which one, and Stanley becomes worried. Just as Michael is about to reveal the true rumor, Jim announces that Pam is actually pregnant to prevent Michael from saying the "wrong" rumor.