Complex sentence: Denton Arthur Cooley (born August 22,1920) is an American heart surgeon famous for pioneering cardiovascular surgery, particularly for performing the first implantation of a total artificial heart.
Split into simpler sentences: Denton Arthur Cooley (born August 22,1920) is an American surgeon famous for pioneering cardiovascular surgery. He is best known for performing the first clinical implantation of a total artificial heart.