Complex sentence: Batman rescues Rachel from a drugged mob and indirectly reveals his identity to her, then pursues Ra's onto the monorail and overpowers him just as Gordon uses the Tumbler's cannons to destroy a section of the track.
Split into simpler sentences: Batman rescues Rachel from a drugged mob and indirectly reveals his identity to her. He pursues Ra's onto the monorail and overpowers him just as Gordon uses the Tumbler's cannons to destroy a section of the track.