Complex sentence: Kaito forces Ian and Tokage out of the bodies that they are possessing and reveals that Ainsel is the key to the door; she merges with Ian and Eriya's body accepts Tokage.
Split into simpler sentences: Kaito forces Ian and Tokage out of the bodies that they are possessing and reveals that Ainsel is the key to the door. She merges with Ian and Eriya's body accepts Tokage.