Original sentence: Purdue University is a member of the Association of American Universities and is classified among "R1: Doctoral Universities – Very high research activity".Purdue has 24 American astronauts as alumni and as of April 2019, the university has been associated with 13 Nobel Prizes
Edited sentence: Purdue University is a member of the Association of American Universities and is classified as a R1 Doctoral Research University under the Carnegie Classification of Institutions of Higher Education, which indicates the highest possible research activity.Purdue boast 24 American astronauts as alumni and as of April 2019, the university has been associated with 13 Nobel Prizes