Original sentence: There is some evidence that Jews fled from Byzantium to Khazaria as a consequence of persecution by some emperors, in particular Heraclius, Justinian II, Leo III, and Romanos I and that Khazar rulers responded by persecuting Christians in Khazaria
Edited sentence: Jews fled from Byzantium to Khazaria as a consequence of persecution by some emperors, in particular Heraclius, Justinian II, Leo III, and Romanos I