Complex sentence: The Dead Lands is an area of a vast obsidian plain to the South of the Tyr Region, inadvertently created by the Defiler Qwith, an agent of Rajaat studying the inner planes.
Split into simpler sentences: The Dead Lands are an area of vast obsidian plains to the South of the Tyr Region. They were inadvertently created by the Defiler Qwith, an agent of Rajaat studying the inner planes.