Complex sentence: Lenny grabs Angie into his mouth, but later regurgitates her, and when Don Lino realizes that "Sebastian" is really Lenny, he chases Oscar through the reef.
Split into simpler sentences: Lenny grabs Angie into his mouth, but later regurgitates her. When Don Lino realizes that "Sebastian" is really Lenny, he chases Oscar through the reef.