Complex sentence: The arrival of an Australian division in Egypt allowed Wavell to withdraw the 4th Indian Division from Operation Compass in the Western Desert and further reinforcements of a battery of 6-inch howitzers and "Infantry" tanks of B Squadron 4th RTR arrived.
Split into simpler sentences: The arrival of an Australian division in Egypt allowed Wavell to withdraw the 4th Indian Division from Operation Compass in the Western Desert. Further reinforcements in the form of a battery of 6-inch howitzers and "Infantry" tanks of B Squadron 4th RTR arrived.