Original sentence: In an article in the pages of the National Review, one given pride of place on the magazine's front cover, van den Haag dismissed recent research debunking innate ethnic differences in intellegence, and stated that he himself believed such differences to exist and to account for "much" of the poorer academic performance of black students, and that such differences necessitated separate schooling
Edited sentence: In an article in the pages of the National Review, one given pride of place on the magazine's front cover, van den Haag dismissed recent research debunking innate ethnic differences in intelligence, and stated that he himself believed such differences to exist and to account for "much" of the poorer academic performance of black students, and that such differences necessitated separate schooling