Complex sentence: Surtur possesses the giant sword Twilight, also known as the Sword of Doom, composed of a god-like metal known as Scabrite, which can only be found in the mines of Sutur's realm.
Split into simpler sentences: Surtur possesses the giant sword Twilight, also known as the Sword of Doom, composed of a god-like metal known as Scabrite. Scabrite can only be found in the mines of Sutur's realm.