Original: Louis Francis "Lou" Costello (March 6, 1906 - March 3, 1959) was an American actor and comedian best known as half of the comedy team of Abbott and Costello, with Bud Abbott.
Simplified: Lou Costello, born Louis Francis Cristillo (March 6, 1906 - March 3, 1959), was an American actor and comedian best known as half of the comedy team of Abbott and Costello, with Bud Abbott.