Original sentence: A 2003 study by David Steiner and Susan Rozen determined that Pedagogy of the Oppressed was frequently assigned at top education schools
Edited sentence: A 2003 study looking at the curricula of 16 schools of education, 14 of them among the top in the country, found that Pedagogy of the Oppressed was one of the most frequently assigned texts in their philosophy of education courses.Such course assignments are a large part of the reason the book has sold almost 1 million copies, which is a remarkable number for a book in the education field