Complex sentence: Marcel is best known in French Canada for appearing in Familiprix television commercials since 2003, and in English Canada for his role in the hit film "Bon Cop, Bad Cop" as Luc Therrien.
Split into simpler sentences: Marcel is best known in French Canada for appearing in Familiprix television commercials since 2003. He would become best known in English Canada for his role in the hit film "Bon Cop, Bad Cop" as Luc Therrien.