Complex sentence: Eunice Sanborn (born July 20,1896-died January 31,2011) was an American supercentenarian, who at age 114, was the oldest verified living person in the world, following the death of Eugénie Blanchard on November 4,2010.
Split into simpler sentences: Eunice Sanborn (July 20,1896--January 31,2011) was an American supercentenarian, who at the age of (age), was the oldest verified living person in the world at the time of her death. She became the recognized titleholder upon the death of Eugénie Blanchard on November 4,2010.