Complex sentence: On the night of the 51st Division attacked High Wood with two battalions of the 154th Brigade at to capture the rest of the wood and fo the Switch Line but one battalion lost direction in the wood and lost many casualties to machine-gun fire.
Split into simpler sentences: On the night of the 51st Division attacked High Wood with two battalions of the 154th Brigade at to capture the rest of the wood and of the Switch Line. One battalion lost direction in the wood and lost many casualties to machine-gun fire.