Complex sentence: The KKK leader is revealed as the Alien Bounty Hunter, who tells Exley that he must die, and demands that Exley revert to his true form before he dies, but Exley refuses.
Split into simpler sentences: The KKK leader is revealed as the Alien Bounty Hunter, who tells Exley that he must die. He demands that Exley revert to his true form before he dies, but Exley refuses.