original: he earned a doctorate in 1950 with a 28 page dissertation on non-cooperative games .
simplifications: he earned a doctorate in 1950 with a 28 page paper on competitive games . he earned a doctorate in 1950 with a 28 page dissertation on non-cooperative games . his 28 page disseration on non-cooperative games earned him his doctorate in 1950 . he was awarded a doctorate on non-cooperative games in 1950 with a 28 page dissertation . he got a doctorate in 1950 with a 28 page paper on non-cooperative games . he earned a doctorate in 1950 with a 28 page dissertation on non-cooperative games . he earned a doctorate in 1950 with a 28 page report on non-cooperative games . he got a doctorate in 1950 with a 28 page paper on non cooperative games .