Complex sentence: The vast majority of those stopped were African-American or Latino, a disparity which, according to a 2007 study, persists even after controlling for "precinct variability and race-specific estimates of crime participation".
Split into simpler sentences: The vast majority of those stopped were African-American or Latino. According to a 2007 study, this disparity persists even after controlling for "precinct variability and race-specific estimates of crime participation".