Complex sentence: She married John George Stuart Donaldson, Baron Donaldson of Kingsbridge (known as Jack) in 1935, and is the author of a series of books on farming and of biographies of Evelyn Waugh, Edward VIII and P. G. Wodehouse.
Split into simpler sentences: She married John George Stuart Donaldson, Baron Donaldson of Kingsbridge (known as Jack) in 1935. She wrote books on farming, and biographies of Evelyn Waugh, Edward VIII and P. G. Wodehouse.