Complex sentence: He played left halfback for Harvard University from 1919 to 1920, and later played in the National Football League for the Racine Cardinals in 1921 and Chicago Cardinals from 1922 to 1924.
Split into simpler sentences: He played left halfback for Harvard University from 1919 to 1920. He later played in the National Football League for the Racine Cardinals in 1921 and Chicago Cardinals from 1922 to 1924.