Complex sentence: She married Captain Dick Honnywill, a naval officer, and after his death, and that of Lady Joyce Fuchs in 1990, married Vivian Fuchs (1908-1999) in 1991.
Split into simpler sentences: She married Captain Dick Honnywill, a naval officer. After his death, and that of Lady Joyce Fuchs in 1990, she married Vivian Fuchs (1908-1999) in 1991.