Complex sentence: The Goblin King is revealed to be Willow's father, who holds her responsible for all the trouble caused and grounds her for a year, though he does admits that he is relieved to have her back.
Split into simpler sentences: The Goblin King is revealed to be Willow's father as he holds her responsible for the trouble that has been caused and grounds her for a year. Though he does admits that he is relieved to have her back.