Complex sentence: With the rise of official bilingualism in the 1960s, however, the latter view has largely fallen into abeyance--few supporters of today's public system would recognize Greenway as an heroic figure from the movement's past.
Split into simpler sentences: With the rise of official bilingualism in the 1960s, however, the latter view has largely fallen into abeyance. Few supporters of today's public system would recognize Greenway as an heroic figure from the movement's past.