Complex sentence: There are several famous scenes, including the twice-told legend of the churning of the seas, once by the priest to show how evil must be exorcised, and again by a good general to show how demons often appear disguised as gods.
Split into simpler sentences: There are several famous scenes, including the twice-told legend of the churning of the seas. This legend is told once by the priest to show how evil must be exorcised, and then told again by a good general to show how demons often appear disguised as gods.