Complex sentence: Earlier Francois Quesnay had developed a cruder version of this technique called Tableau économique, and, in essence, Léon Walras's work "Elements of Pure Economics" on general equilibrium theory was both a forerunner and generalization of Leontief's seminal concept.
Split into simpler sentences: Earlier Francois Quesnay developed a cruder version of this technique called Tableau économique. And, in essence, Léon Walras's work "Elements of Pure Economics" on general equilibrium theory is both a forerunner and generalization of Leontief's seminal concept.