Complex sentence: The organisations campaigning for trade justice posit this concept in opposition to free trade, the advocates of which often also claim pro-poor outcomes, as they start from a premise that approriate intervention in markets is necessary as opposed to no or little government role in free markets.
Split into simpler sentences: The organisations campaigning for trade justice posit this concept in opposition to free trade, the advocates of which often also claim pro-poor outcomes. Trade justice advocates start from a premise that approriate intervention in markets is necessary as opposed to no or little government role in free markets.