Complex sentence: Fafnir was once the King of Nastrond, a extradimensional realm on the continent of Asgard Both Fafnir and his people were thoroughly evil, and Odin destroyed the kingdom and all of Fafnir's subjects.
Split into simpler sentences: Fafnir was once the King of Nastrond, a extradimensional realm on the continent of Asgard. Odin, destroys the kingdom and all of Fafnir's subjects.