Complex sentence: Later in 1942,12 Field Ambulance sailed to England with the 4th (Canadian) Armoured Division acting as medical support as they progressed within Europe.
Split into simpler sentences: Later in 1942,12 Field Ambulance sailed to England with the 4th (Canadian) Armoured Division. During the war, the unit acted as medical support for the 4th Canadian Armored Division as they progressed within Europe.