Original: Her offspring, Huitzilopochtli, learned of this plan while still in the womb, and before it was put into action, sprang from his mother's womb fully grown and fully armed.
Simplified: Her offspring, Huitzilopochtli, learned of this plan while still in the womb, and before it was put into action, sprang from his mothers womb fully grown and fully armed and killed his sister Coyolxauhqui, together with many of his 400 brothers and sisters.