Complex sentence: However, Voll has noticed what happened, and a Troll, one of the evil one's servants, finds and takes out of the water the fish Festin-who is trapped by his own spell and cannot change back.
Split into simpler sentences: However, Voll has noticed what happened, and a troll, one of the evil one's servants, finds and takes Festin out of the water. The wizard is trapped by his own spell and cannot change back.