Complex sentence: Oates was 22 when, after a three-month courtship, she married the 31-year old Smith in 1961, but the couple had no children and neither wrote about that aspect of their marriage.
Split into simpler sentences: Oates was 22 when, after a three-month courtship, she married the 31-year old Smith in 1961. The couple had no children, and neither wrote about that aspect of their marriage.