Complex sentence: Some research has indicated that as many as 15 percent of freshmen enrolled at some of America's most selective colleges are wealthy white teens who failed to meet their institutions' minimum admissions standards, furthermore these wealthy white teens outnumber students who benefit from affirmative action.
Split into simpler sentences: Some research has indicated that as many as 15 percent of freshmen enrolled at some of America's most selective colleges are wealthy white teens who failed to meet their institutions' minimum admissions standards. Furthermore these wealthy white teens outnumber students who benefit from affirmative action.