Complex sentence: A year after the events of Kirara, Kuromi and Baku are imprisoned in a dungeon in Mary Land but then made their escape along with the Melody Key and the Melody Bow, but in their haste, forget the instruction manuals.
Split into simpler sentences: A year after the events of Kirara, Kuromi and Baku are imprisoned in a dungeon in Mary Land. They make their escape with the Melody Key and the Melody Bow, but in their haste forget the instruction manuals.