Complex sentence: John Maynard Keynes, 1st Baron Keynes (5 June 1883--21 April 1946), was a British economist whose ideas fundamentally changed the theory and practice of macroeconomics and the economic policies of governments.
Split into simpler sentences: John Maynard Keynes, 1st Baron Keynes (5 June 1883--21 April 1946), was a British economist. His ideas fundamentally changed the theory and practice of macroeconomics and the economic policies of governments.