Complex sentence: Mira is freed, but he is no longer capable of living outside the mirror and dies in Evly's arms and both are consumed by the mirror as the castle is invaded by the army that set out to save the Queen's captives.
Split into simpler sentences: Mira is freed, but he is no longer capable of living outside the mirror and dies in Evly's arms. Both are consumed by the mirror as the castle is invaded by the army that set out to save the Queen's captives.