Simplify the following text for a Grade 11 native English-speaking person.
Original: While Aslan and Edmund 's sisters race to free the cursed prisoners in the Witch 's castle , Edmund consolidates his reformation by aligning himself with Peter 's army in battle , where he plays a critical role in neutralizing the White Witch 's most dangerous advantage , her wand , and is gravely wounded in the attempt .
Simplified: While Aslan and Lucy and Susan race to free the stone prisoners in the Witch 's castle , Edmund joins Peter 's army in the battle , where he plays a role in breaking the White Witch 's dangerous wand , and is wounded in the attempt .