Complex sentence: The two attacking battalions of the 47th Brigade on the right, were held back for two minutes after zero hour, for a final hurricane bombardment but the 48th Brigade on the left attacked on schedule which brought down a German counter-barrage.
Split into simpler sentences: The two attacking battalions of the 47th Brigade on the right flank, were held back for two minutes after zero hour for a final hurricane bombardment. The 48th Brigade on the left attacked on schedule, which brought down a German counter-barrage.