Complex sentence: Donaldson was the wife of John Donaldson, Baron Donaldson of Lymington, who was Master of the Rolls (1982-92); they wed in 1945 and had two daughters and a son.
Split into simpler sentences: Donaldson was the wife of John Donaldson, Baron Donaldson of Lymington, who was Master of the Rolls from 1982 to 1992. They married in 1945 and had two daughters and a son.