Complex sentence: On January 25,1959, Pope John XXIII announced that he planned to convene the Second Vatican Council and on June 6,1960, Fr. Bugnini was appointed the Secretary of the Pontifical Preparatory Commission on the Liturgy.
Split into simpler sentences: On January 25,1959, Pope John XXIII announced that he planned to convene the Second Vatican Council. On June 6,1960, Fr. Bugnini was appointed to the Secretary of the Pontifical Preparatory Commission on the Liturgy.