Complex sentence: Between 1942 and 1945, the marsh was used by the Royal Tank Regiment; an armoured fighting vehicle gunnery range was established and new banks were constructed for firing practise, with targets set at 900 m (1000 yd) intervals.
Split into simpler sentences: Between 1942 and 1945, the marsh was used by the Royal Tank Regiment. An armoured fighting vehicle gunnery range was established and new banks were constructed for firing practise, with targets set at 900 m (1000 yd) intervals.