Complex sentence: Dracula escapes their feeble attempt to kill him and bursts into the asylum to free the captive Lucy-while there he murders his one time slave, Milo Renfield (Tony Haygarth) for warning the others about him.
Split into simpler sentences: Dracula escapes their feeble attempt to kill him and bursts into the asylum to free the captive Lucy. While there he murders his one time slave, Milo Renfield (Tony Haygarth) for warning the others about him.