Complex sentence: While at Beaumont, at the age of 17 he joined the Society of Jesus as a novice, he was to remain a Jesuit until he resigned the priesthood 29 years later in 1977.
Split into simpler sentences: While at Beaumont, at the age of 17 he joined the Society of Jesus as a novice. He was to remain a Jesuit until he resigned the priesthood 29 years later in 1977.