Complex sentence: A renegade member of the Komnenos family, also named Isaac, established a separate "empire" on Cyprus in the 12th century, which lasted until the island was taken from him by Richard I of England during the Third Crusade.
Split into simpler sentences: A renegade member of the Komnenos family, also named Isaac, established a separate "empire" on Cyprus in the 12th century. The island was taken from him by Richard I of England during the Third Crusade.