Complex sentence: During the Second World War the house acted as a Training Depot and Headquarters of the Intelligence Corps, although by 1945 conditions for trainee intelligence soldiers had deteriorated to such a state that questions were asked in the House of Commons.
Split into simpler sentences: During the Second World War the house acted as a Training Depot and Headquarters of the Intelligence Corps. Although by 1945 conditions for trainee intelligence soldiers had deteriorated to such a state that questions were asked in the House of Commons.