Complex sentence: Just prior to or at the moment Coatlicue is decapitated, Huitzilopochtli leaps fully armed out of her womb, cuts off Coyolxauhqui's head, and throws her off the temple.
Split into simpler sentences: Just prior to or at the moment Coatlicue is decapitated, Huitzilopochtli leaps fully armed out of her womb. He cuts off Coyolxauhqui's head and throws her off the temple.