Complex sentence: Originally married to Air Force Major Henry Landingham, who served in the Korean War, Mrs. Landingham is a widow by the time she works in the White House, and her twin sons had been killed in the Vietnam War on Christmas Eve 1970.
Split into simpler sentences: Originally married to Air Force Major Henry Landingham, who served in the Korean War, Mrs. Landingham is a widow by the time she works in the White House. It is revealed that her twin sons had been killed in the Vietnam War on Christmas Eve 1970.