Complex sentence: Gloria Morgan Vanderbilt (August 23,1904February 13,1965) was a socialite best known as the mother of fashion designer and artist Gloria Vanderbilt and maternal grandmother of American television journalist Anderson Cooper.
Split into simpler sentences: Gloria Morgan Vanderbilt (August 23,1904February 13,1965) was a socialite best known as the mother of fashion designer and artist Gloria Vanderbilt. She is also the maternal grandmother of American television journalist Anderson Cooper.