Complex sentence: Hank Venture falls for and tries to woo both of them, and both of them fall for and try to seduce Dean Venture, and then immediately fall for Hank after he is attacked by the wereodile of the episode.
Split into simpler sentences: Hank Venture falls for and tries to woo both of them, and both of them fall for and try to seduce Dean Venture. Initially the girls reject Hank's overtures, but become attracted to him after he is attacked by the wereodile of the episode.