Complex sentence: He was the son of Rao Suraj Mal, 11th Rao of Bundi, who had married a daughter of Maharana Sangram Singhji I of Mewar.
Split into simpler sentences: He was the son of Rao Suraj Mal, 11th Rao of Bundi. His mother was daughter of Maharana Sangram Singhji I of Mewar.