Complex sentence: The Vampire Coast, which is inhabited by the abovementioned undead, lies on the Southern coast of Lustria, ans is ruled by a ruthless vampire pirate named Luthor Harkon, a mad vampire with an unknown blood line.
Split into simpler sentences: The Vampire Coast, which is inhabited by the abovementioned undead, lies on the Southern coast of Lustria. Which is ruled by a ruthles vampire pirate named Luthor Harkon who is a mad vampire with an unknown blood line.