Complex sentence: On 13 August, Bakr Sidqi moved his troops to Alqosh where he planned to inflict a further massacre on the Assyrians who found refuge there had he not been prevented by the Chaldean Patriarch Yousef VI Emmanuel II Thomas.
Split into simpler sentences: On 13 August, Bakr Sidqi moved his troops to Alqosh, where he planned to inflict a further massacre on the Assyrians who found refuge there. He was prevented in this by the intervention of the Chaldean Patriarch Yousef VI Emmanuel II Thomas.