Complex sentence: Sylvia and Vaughn join in the dance, but Sylvia begins to hallucinate that the attendants are egging her on to dance in an increasingly suggestive manner; she ultimately ends up picking up a bottle of water with her crotch.
Split into simpler sentences: Sylvia and Vaughn join in the dance, but Sylvia begins to hallucinate that the attendants are encouraging her on to dance in an increasingly suggestive manner. She ends up picking up a bottle of water with her crotch.