Complex sentence: Turning to her, Charlie informs her the gun is empty, and says to her "I will always protect you, baby", when David rises behind him and slams a bear trap down on his head, which shuts and ensnares him.
Split into simpler sentences: Turning to her, Charlie informs her the gun is empty. Before Charlie can hurt her, David rises behind him and slams a bear trap down on his head, which shuts and ensnares him.