Complex sentence: Lucien-Rene Duchesne (9 March 1908, in Paris (15th arrondissement)--14 October 1984, Le Chesnay), was mayor of la Celle-Saint-Cloud (Yvelines) from 1959 to 1981.
Split into simpler sentences: Lucien-Rene Duchesne was born in Paris (15th arrondissement) on 9 march 1908, dead on 14 october 1984,, at le Chesnay (Yvelines). He was elected city mayor of la Celle Saint-Cloud (Yvelines, France) from 1959 to 1981.