Complex sentence: Efficient division of labor is the unifying element of the different units, and it is also a function of capitalism, a system based on competition between free producers using free labor with free commodities,'free' meaning available for sale and purchase on a market.
Split into simpler sentences: Efficient division of labor is the unifying element of the different units, and it is also a function of capitalism. Capitalism is a system based on competition between free producers using free labor with free commodities,'free' meaning available for sale and purchase on a market.