Complex sentence: The party returns, defeats Nachtigal, and discover that Gaius, Auj Oule's king, has taken the lance and intends to unite Rieze Maxia with its power.
Split into simpler sentences: The party returns, defeats Nachtigal, and discover that the Lance has been relocated. They discover that Gaius, the king of the opposing country Auj Oule, has the Lance and intends to unite Rieze Maxia with its power.