Complex sentence: After the Dhampires tried to form a treaty with them, the Sirens ended up winning the game; as a result, they can now mate with male Dhampires, while the Dhampires can only drink their blood.
Split into simpler sentences: After the Dhampires tried to form a treaty with them, the Sirens won the game. As a result, they can now mate with male Dhampires, while the Dhampires can only drink their blood.