Complex sentence: The act of exception passed in 1883 deprived all members of families that had reigned in France of their military positions; consequently the duc d'Aumale was placed on the unemployed supernumerary list.
Split into simpler sentences: The act of exception, passed in 1883, deprived all members of families that had reigned in France of their military positions. Consequently, the duc d'Aumale was placed on the unemployed supernumerary list.