Complex sentence: Achren identifies Arawn in the form of a serpent near to striking Taran and grabs him; he strikes her fatally, but Taran cleaves him with Dyrnwyn before he can strike again.
Split into simpler sentences: Achren identifies Arawn in the form of a serpent near to striking Taran and grabs him. He strikes her fatally, but Taran cleaves him with Dyrnwyn before he can strike again.