Complex sentence: A sea storm sends the pirate ship on which the characters are being held off course, and it crashes on an island once ruled by Viledel, the Sea King, on which a treasure has become the cause of a battle between orcs and goblins.
Split into simpler sentences: A sea storm sends the pirate ship on which the characters are being held off course, and it crashes on an island once ruled by Viledel, the Sea King. On this island, a treasure has become the cause of a battle between orcs and goblins.