Complex sentence: During his time in the United States Macquarrie became a member of the Anglican Communion; he had long been attracted to the Anglican Church, but in deference to his family's feelings and their strong Presbyterian roots maintained his worship in the Church of Scotland.
Split into simpler sentences: During his time in the United States Macquarrie became a member of the Anglican Communion. He had long been attracted to the Anglican Church but in deference to his family's feelings and their strong Presbyterian roots maintained his worship in the Church of Scotland.