Complex sentence: He was named Bishop of Berlin on January 15,1957, and became the youngest member of the College of Cardinals when he was created Cardinal Priest of "S. Maria della Scala" by Pope John XXIII in the consistory of December 15,1958.
Split into simpler sentences: He was named Bishop of Berlin on January 15,1957. Döpfner became the youngest member of the College of Cardinals when he was created Cardinal Priest of "S. Maria della Scala" by Pope John XXIII in the consistory of December 15,1958.