Original: From 1891 on, Naismith taught physical education and became the first McGill director of athletics, but then left Montreal to become a physical education teacher at the YMCA International Training School in Springfield, Massachusetts.
Simplified: From 1891 on, Naismith taught physical education and became the first McGill director of athletics. He left Montreal to become a physical education teacher at the YMCA International Training School in Springfield, Massachusetts.