Complex sentence: About 90% of Asian-American students graduate on time, as do 88% of Latino students, yet only 38% of its African-American students do so, which is the worst rate in the district.
Split into simpler sentences: About 90% of its Asian-American students graduated on time, as did 88% of Latino students. However, only 38% of its African-American students graduated on time, which was the worst rate in the district.