Complex sentence: His crew was attacked by the savage men that oppose the Shing, that erased his memory of his previous self, and the Shing, that managed to save his younger companion, now want to restore his previous identity.
Split into simpler sentences: His crew was attacked by the savage men that oppose the Shing; it was those savages who erased his memory of his previous self. The Shing, who managed to save his younger companion, now want to restore his previous identity.