Complex sentence: At St John's last diocesan synod, (Archbishop) Arnott spoke of his "selfless devotion" to the diocese and... it will be for his "selfless devotion" to his Lord and his Church that he will be principally remembered.
Split into simpler sentences: At St John's last diocesan synod, Archbishop Arnott spoke of his "selfless devotion" to the diocese. It will be for his "selfless devotion" to his Lord and his Church that he will be principally remembered.