Complex sentence: In this they were aided by Mohammad Amin al-Husayni, the British appointee as the Grand Mufti of Jerusalem, who had fled from Palestine shortly before the outbreak of war and later received asylum in Baghdad.
Split into simpler sentences: In this they were aided by Mohammad Amin al-Husayni, the Grand Mufti of Jerusalem. The Grand Mufti had fled from Palestine shortly before the outbreak of war and later received asylum in Baghdad.