Complex sentence: Gerrit Jan Heijn (February 14,1931--September 9,1987) was a Dutch businessperson, who was a top manager of "Ahold" until his death in 1987.
Split into simpler sentences: Gerrit Jan Heijn (February 14,1931-September 9,1987) was a Dutch businessperson. He was a top manager of "Ahold" until his death in 1987.