Complex sentence: Marie-Dominique Chenu (OP) (7 January 1895, Soisy-sur-Seine, Essonne--11 February 1990, Paris) was a progressive Roman Catholic theologian and a founder of the reformist journal "Concilium".
Split into simpler sentences: Marie-Dominique Chenu (OP) (7 January 1895, Soisy-sur-Seine, Essonne--11 February 1990, Paris). Chenu was a progressive Roman Catholic theologian and a founder of the reformist journal "Concilium".