Complex sentence: On August 18,1917, when Britain promised India self-rule and self-government, Hadhrat Mufti realised that, if the Ulama did not join the political movements and direct the Muslims, then mistakes would result which could be harmful to the Muslims.
Split into simpler sentences: On August 18,1917, Britain promised the people of India self-rule and self-government. At that point, Hadhrat Mufti realised that, if the Ulama did not join the political movements and direct the Muslims, then mistakes would result which could be harmful to the Muslims.