Complex sentence: The indigenous and peasant advocacy organization Vía Campesina is active in Bolivia's food sovereignty movement, purporting that food is primarily a people's resource and source of nutrition and should only secondarily be an item of trade.
Split into simpler sentences: The indigenous and peasant advocacy organization Vía Campesina is active in Bolivia's food sovereignty movement. They advance the idea that food is primarily a people's resource and source of nutrition and should only secondarily be an item of trade.