Complex sentence: Buffy then says that if they can destroy the First, the Scoobies all get to live and Ethan doesn't get the power he desires, and asks Sid if he had ever heard about Hope's Dagger, to which he says he has.
Split into simpler sentences: Buffy then says that there is another way; if they can destroy the First, the Scoobies all get to live and Ethan doesn't get the power he desires. She asks Sid if he had ever heard about Hope's Dagger, to which he says he has.