Complex sentence: Ratti was elected pope on the conclave's fourteenth ballot on 6 February 1922 and took the name "Pius XI", explaining that Pius IX was the pope of his youth and Pius X had appointed him head of the Vatican Library.
Split into simpler sentences: Ratti was elected pope on the conclave's fourteenth ballot on 6 February 1922. When asked what name he would take, he took the name "Pius XI", explaining that Pius IX was the pope of his youth and Pius X had appointed him head of the Vatican Library.