Complex sentence: The brainchild of Sir Henry Lawrence, the Corps was raised in Peshawar by Lt. Harry Lumsden in December 1846, and initially comprised one troop of cavalry and two companies of infantry.
Split into simpler sentences: The brainchild of Sir Henry Lawrence, the Corps had modest beginings. When it was raised in Peshawar by Lt. Harry Lumsden in December 1846, it comprised just one troop of cavalry and two companies of infantry.