Complex sentence: Despite his lunacy, Chihiro is very insightful of people and is secretly in contact with Kanau's mother, Nozomi Yukimura, whom he grew up in an orphanage with.
Split into simpler sentences: Despite his lunacy, Chihiro is very insightful of people. He was secretly in contact with Kanau's mother, Nozomi Yukimura, whom he grew up in an orphanage with.