Complex sentence: There were 35,099 applications for the undergraduate class of 2020 (entering 2016), and 3,751 (10.7%) were admitted, making Northwestern one of the most selective schools in the United States.
Split into simpler sentences: There were 35,099 applications for the undergraduate class of 2020 (entering 2016). In total, 3,751 out of 35,099 applicants were admitted for an overall acceptance rate of 10.7%, making Northwestern one of the most selective schools in the United States.