Complex sentence: Morn, mostly known for the jarring wound seething with chaos in the thin air, and the city of Elingarth, from whence the legendary company of the Grey Swords came, the army sworn to the Boar of Summer.
Split into simpler sentences: Morn, mostly known for the jarring wound seething with chaos in the thin air. And the city of Elingarth, from whence the legendary company of the Grey Swords came, the army sworn to the Boar of Summer.