Complex sentence: After his death his son Muhammad Ali Khan took over, but he was killed by the Rohilla leaders after 24 days, and Ghulam Muhammad Khan, the brother of the deceased, was proclaimed Nawab.
Split into simpler sentences: After his death his son Muhammad Ali Khan took over. He was assassinated by Rohilla elders after reigning for 24 days, and Muhammad Ali Khans's brother, Ghulam Muhammad Khan, was proclaimed Nawab.