Complex sentence: He ran into the Vulture, rejuvenated and attempting to kill all who knew him as an old man, the Vulture mistaking this Prowler for the original and unconcerned about the mistake.
Split into simpler sentences: He ran into the Vulture, rejuvenated and attempting to kill all who knew him as an old man. The Vulture mistook this Prowler for the original and was unconcerned about the mistake.