Complex sentence: It housed some high ranking British and Commonwealth officers, including Major-General Sir Adrian Carton de Wiart who was employed by the Italian government in the Armistice negotiations with the Allies in 1943.
Split into simpler sentences: It housed some high ranking British and Commonwealth officers. One of these officers, Major-General Sir Adrian Carton de Wiart VC, KBE, CB, CMG, DSO (1880--1963) was used by the Italian government in the Armistice negotiations with the Allies in 1943.