Original: According to the Prose Edda, Odin took Loki's three children, Fenrisúlfr, Hel and Jörmungandr, and tossed Jörmungandr into the great ocean that encircles Midgard.
Simplified: According to the myth, Odin took Lokis three children, Fenrisulfr, Hel and Jörmungandr.