Complex sentence: The parachute battalions in the brigade were the experienced 7th (Light Infantry) Parachute Battalion, which was transferred from the 3rd Parachute Brigade, and two newly raised battalions, the 12th (Yorkshire) Parachute Battalion and the 13th (Lancashire) Parachute Battalion.
Split into simpler sentences: The parachute battalions in the brigade were the experienced 7th (Light Infantry) Parachute Battalion, transferred from the 3rd Parachute Brigade and two newly raised battalions. The 12th (Yorkshire) Parachute Battalion and the 13th (Lancashire) Parachute Battalion.