Original sentence: Cardinal Pacelli was in the position of a specialist advisor for several decades before ascending the Throne of St Peter.Hitler's Pope generally refers to Cardinal Eugenio Pacelli who became Pope Pius  XII, however the previous Pope Pius XI dealt with Adolf Hitler through various intermediaries, and the separation of actions between these two Pope's is difficult.In contrast to collegiality of councils or bishops thereto, this centralisation progressed during the 20th century, stimulated by the threatening factors of marxism, materialism, sexual liberation and rational scepticism.Specifying Pacelli as outstandingly representative of the recent (since 1870) drive within the Catholic Church towards the autocratic absolute leadership principle, that of dictatorial and centralised papal power.The expression Hitler's Pope has been in use for many decades , certainly in English.The linking of the two names Pope and Hitler succinctly expressed popular conception that the Holy See colluded with the Fuhrer of the Third Reich
Edited sentence: Cardinal Pacelli  was  in the position of a specialist advisor for several decades before ascending the Throne of St Peter.Hitler's Pope generally refers to Cardinal Eugenio Pacelli who became Pope Pius  XII , however the previous Pope Pius XI dealt with Adolf Hitler through various intermediaries  , and the separation of  actions between these two Pope's is difficult.In contrast to collegiality of councils or bishops thereto , this centralisation progressed during the 20th century , stimulated by the threatening factors of marxism, materialism , sexual liberation and rational scepticism.Specifying Pacelli as outstandingly representative of the recent (since 1870) drive within the Catholic Church towards the autocratic absolute leadership principle , that of dictatorial and centralised papal power.The expression Hitler'sPope has been in use for many decades , certainly in English.The linking of the two names Pope and Hitler succinctly expressed popular conception  that the Holy See colluded with the Fuhrer of the Third Reich