Complex sentence: Pope Benedict XV created him Cardinal Priest of "S. Maria del Popolo" in the consistory of December 15,1919, receiving his cardinalatial biretta from King Alphonse XIII on Christmas Day of that same year.
Split into simpler sentences: Pope Benedict XV created him Cardinal Priest of "Santa Maria del Popolo" in the consistory of December 15,1919. He received his cardinalatial biretta from King Alphonse XIII on Christmas Day of that same year.