Complex sentence: In the 19th century there were rumors that Prince Sado had not been mentally ill, but had been framed; however, these rumors are contradicted by the memoirs of Prince Sado's wife, Lady Hong.
Split into simpler sentences: In the 19th century there were rumors that Prince Sado had not been mentally ill but had been framed. However these rumors are contradicted by the memoirs of Prince Sado's wife, Lady Hong.