Complex sentence: His grandfather Khwaja Gulam Abbas was one of the chief rebels of the 1857 movement, and the first martyr of Panipat to be blown from the mouth of a cannon.
Split into simpler sentences: His grandfather Khwaja Gulam Abbas was one of the chief rebels of the 1857 movement. He was the first martyr of Panipat to be blown from the mouth of a cannon.