Complex sentence: The new battalion was commanded by Lieutenant Colonel Robin Chappell, who had previously been commander of the neighbouring 2 UDR, the first regular officer to command the 2nd battalion, and was the only regular officer ever to command two separate UDR battalions.
Split into simpler sentences: The new battalion was commanded by Lieutenant Colonel Robin Chappell, who had previously been commander of the neighbouring 2 UDR. He was the first regular officer to command the 2nd battalion, and the only regular officer ever to command two separate UDR battalions.