Complex sentence: However, Kazmatsuri cannot stand The Countess of Werdenberg because she refuses to tell the orga-superior and the siblings the truth about Twin X and their father's connection to it as well, the siblings want to know the truth about how they were born.
Split into simpler sentences: However, Kazmatsuri cannot stand The Countess of Werdenberg because she refuses to tell the Orga-Superior and the siblings the truth about Twin X and their father's connection to it. As well, the siblings want to know the truth about how they were born.