Complex sentence: These "physiocrats" opposed mercantilism (a closed trading system that influenced the economic policies of most governments at the time), many argued that land, not the gold and silver that many kings were hoarding, was the true source of wealth.
Split into simpler sentences: These "physiocrats" opposed mercantilism (a closed trading system that influenced the economic policies of most governments at the time). Many argued that land, not the gold and silver that many kings were hoarding, was the true source of wealth.