Complex sentence: Dracula makes good on his word and leaves Harker to the sisters when he heads for England, but Harker manages to escape the castle before they can drain him, though he is badly traumatized by the encounter.
Split into simpler sentences: Dracula makes good on his word and leaves Harker to the sisters when he heads for England. But Harker manages to escape the castle before they can drain him, though is badly traumatized by the encounter.