Complex sentence: Sapieha dies in 1951, Wojtyla is appointed Professor of Social Ethics in 1956 at Catholic University of Lublin and in 1958, at only 38, the Holy See appoints him Krakow's Auxiliary Bishop.
Split into simpler sentences: Sapieha dies in 1951 and in 1956, Wojtyla is appointed Professor of Social Ethics at Catholic University of Lublin. In 1958, at only 38, the Holy See appoints him Krakow's Auxiliary Bishop.