Complex sentence: When Theena the Elf Queen passes down the ability to become all of the Elemental Warriors and the Wotnot Book to her younger daughter Kameo, Kalus the first daughter grows jealous and in an act of revenge, she kidnaps her mother, her relatives and tortures them.
Split into simpler sentences: When Theena the Elf Queen passes down the ability to become all of the Elemental Warriors and the Wotnot Book to her younger daughter Kameo, Kalus, the first daughter, grows jealous. In an act of revenge, she kidnaps her mother and other relatives and tortures them.