Complex sentence: He vows to avenge their deaths in a lifelong battle against crime in the guise of Batman while concealing his secret identity, adopting the public face of a billionaire playboy and head of Wayne Enterprises.
Split into simpler sentences: He vows to avenge their deaths in a lifelong battle against crime in the guise of Batman. As an adult, he adopts the public face of a billionaire playboy and head of Wayne Enterprises.