Complex sentence: Wilson, p.180 Gradually the division's units left the country, the division's last units comprising part of divisional headquarters, the 1st Parachute Battalion and the 1st Airborne Squadron Royal Engineers departed on 18 May.
Split into simpler sentences: Wilson, p.180 Gradually the division's units left the country. The division's last units, comprising part of divisional headquarters, the 1st Parachute Battalion and the 1st Airborne Squadron Royal Engineers, departed on 18 May.