Simplify the following text for a Grade 15 native English-speaking person.
Original: In 1955 and again in 1958 Hurwicz was a visiting professor , and a fellow on the second visit , at Stanford University and there in 1959 he published `` Optimality and Informational Efficiency in Resource Allocation Processes '' on making rules for buyers and sellers and governments share wealth .
Simplified: In 1955 and again in 1958 Hurwicz was a visiting professor , and a fellow on the second visit , at Stanford University and there in 1959 published `` Optimality and Informational Efficiency in Resource Allocation Processes '' on mechanism design .