Complex sentence: They lived with Kaoru and her husband for several months until Yuka decided to leave and was forced to give Mikan up to an elderly man when Mikan fell ill and the academy was close to capturing them.
Split into simpler sentences: They lived with Kaoru and her husband for several months until Yuka decided to leave. She was forced to give Mikan up to an elderly man when Mikan fell ill and the academy was close to capturing them.