Complex sentence: Then at 17:30, the divisional commander Harry Chauvel called off the attack and ordered a withdrawal, but as the New Zealanders were in danger of being overrun the withdrawal was postponed until dark, with the regiment forming a rearguard.
Split into simpler sentences: Then at 17:30 the divisional commander Harry Chauvel called off the attack and ordered a withdrawal. But as the New Zealanders were in danger of being overrun the withdrawal was postponed until dark, with the regiment forming a rearguard.