Complex sentence: A furious barrage began on the morning of 2 June 1942, and all of the resources of the "Luftwaffe" s "Luftflotte 4", commanded by Wolfram von Richthofen, were committed, continuing for five days before the ground assault began.
Split into simpler sentences: A furious barrage began on the morning of 2 June 1942. All of the resources of the "Luftwaffe" s "Luftflotte 4", commanded by Wolfram von Richthofen, were committed; the barrage continued for five days before the ground assault began.