Complex sentence: He was appointed as Second in Command of the Bengal Military Police Battalion on its formation, 15 April 1856, while simultaneously holding the positions within the unit of Commandant of Cavalry and Officiating Commandant.
Split into simpler sentences: He was appointed as Second in Command of the Bengal Military Police Battalion on its formation, 15 April 1856. He also held the positions within the unit of Commandant of Cavalry and Officiating Commandant.