Complex sentence: Macroeconomics (from the Greek prefix "makro -" meaning "large" and economics) is a branch of economics dealing with the performance, structure, behavior, and decision-making of an economy as a whole, rather than individual markets.
Split into simpler sentences: Macroeconomics (from the Greek prefix "makro -" meaning "large" and economics) is the study of the macroeconomy. It is a branch of economics dealing with the performance, structure, behavior, and decision-making of an economy as a whole, rather than individual markets.