Complex sentence: He and most of his passengers die during the awakening of CarnEvil, then Tökkentäkker transforms his remains into Hambone, who is the periodic Sub-boss for the Haunted House Stage.
Split into simpler sentences: He and most of his passengers die during the awakening of CarnEvil. Then Tökkentäkker transforms his remains into Hambone, who is the periodic Sub-boss for the Haunted House Stage.