Complex sentence: Hürrem decided to take her sons, Bayezid and Cihangir (who had remained at the Palace) away from Mustafa but Şah took Hürrem's sons to an old farm.
Split into simpler sentences: Hürrem decided to take her sons, Bayezid and Cihangir (whom stay in the Palace) away from Mustafa. But, Şah took Hürrem's sons to an old farm.