Complex sentence: Andrea Bronfman (1945-January 23 2006) was a philanthropist and wife of billionaire Charles Bronfman, who was once co-chairman of Seagram's Co. She died after being struck by a car in New York City in January, 2006.
Split into simpler sentences: Andrea Bronfman (1945-January 23 2006) was a philanthropist and wife of billionaire Charles Bronfman. He was once co-chairman of Seagram's Co. She died after being struck by a car in New York City in January, 2006.