Complex sentence: He was impressed by Chaudhry Afzal Haq who was a great political leader of Indian sub-continent, so he joined All-India Majlis-e-Ahrar-e-Islam and struggle for Ahrar Party.
Split into simpler sentences: He was impressed by Chaudhry Afzal Haq who was a great political leader of Indian sub-continent. So, he joined All-India Majlis-e-Ahrar-e-Islam and struggle for Ahrar Party.