Complex sentence: Savage utility function is the theory that Milton Friedman and Leonard J. Savage put forth in their 1948 paper, which argued that the curvature of an individual's utility function differs based upon the amount of wealth the individual has.
Split into simpler sentences: Savage utility function is the utility function postulated in the theory that Milton Friedman and Leonard J. Savage put forth in their 1948 paper. They argued that the curvature of an individual's utility function differs based upon the amount of wealth the individual has.