Complex sentence: During the summer of 1944, the commander of the new British 6th Airborne Division, Richard Nelson Gale gave Pearson command of the division's 8th Battalion, which had been formed from the Royal Warwickshire Regiment.
Split into simpler sentences: During the summer of 1944, Pearson was given command of the 8th Battalion of the new British 6th Airborne Division by the division's commander Richard Nelson Gale. The 8th had been formed from the Royal Warwickshire Regiment.