Complex sentence: The British official Normandy campaign historian, Major L. F. Ellis, explains the 22nd Armoured Brigade group's withdrawal by claiming that with the unexpected arrival of the 2nd Panzer, the 7th Armoured Division "could hardly have achieved full success".
Split into simpler sentences: The British official Normandy campaign historian, Major L. F. Ellis, explains the 22nd Armoured Brigade group's withdrawal by claiming that with the unexpected arrival of the 2. Panzer-Division, the 7th Armoured Division "could hardly have achieved full success".