Complex sentence: Kennedy then attended the Pontifical North American College in Rome, Italy and was ordained a priest of the Archdiocese of Boston on December 17,1966.
Split into simpler sentences: Kennedy then attended the Pontifical North American College in Rome, Italy and was ordained a priest of the Archdiocese of Boston in 1966. Kennedy was ordained to the priesthood for the Boston Archdiocese on December 17,1966.