Complex sentence: The school's racial/ethnic make-up was 40% white/Caucasian, 29% Latino/Hispanic, 31% black/African-American, which is considered quite diverse for a rural school in this geographic area.
Split into simpler sentences: The school's racial/ethnic make-up was 40% white/Caucasian, 29% Latino/Hispanic, 31% black/African-American. Which is considered quite diverse for a rural school in this geographic area.