Complex sentence: After Yuko was born, Liao was summoned back by his master, Archbishop Riji, to fight the Dairangers after the Triumvirate failed to do so, but stopped upon hearing his son is the new Ryu Ranger.
Split into simpler sentences: After Yuko was born, Liao was summoned back by his master, Archbishop Riji. He was sent to fight the Dairangers after the Triumvirate failed to do so, only to stop upon hearing his son is the new Ryu Ranger.