Complex sentence: Heather Louise McCartney (born on December 31 1962), née Heather Louise See, is the biological daughter of Linda (nee Eastman) and John Melvin See Jr., an American geologist.
Split into simpler sentences: Heather Louise McCartney (née Heather Louise See) was born on December 31,1962. She is the biological daughter of Linda (nee Eastman) and John Melvin See Jr., an American geologist.