Complex sentence: Fortunately, the imo-youkan he ate had expired and wore off before either he could do harm to them and is saved by Zelmonda before the Carrangers could do him harm.
Split into simpler sentences: Fortunately, the imo-youkan he ate had expired and wore off before either could do harm to the other. He is also saved by Zelmoda before the Carrangers could do him harm.