Original sentence: Muravchik was National Chairman of the Young People's Socialist League (YPSL) from 1968 to 1973.he was one of the leaders of the tendency that drove the YPSL to the right and caused it to abandon, temporarily, its socialist principles
Edited sentence: Muravchik was National Chairman of the Young People's Socialist League (YPSL) from 1968 to 1973, during which time YPSL opposed the Maoism and other totalitarian tendencies in the American new left