Complex sentence: Specifically, it emphasizes the importance of rigorous foundations, in which the macroeconomic model is built in analogy to the actions of individual agents, whose behavior is modeled by microeconomics.
Split into simpler sentences: Specifically, it emphasizes the importance of rigorous foundations based on microeconomics. Macroeconomic model is built in analogy to the actions of individual agents, whose behavior is modeled by microeconomics.