Original: Others suggest that many of the peoples living under the rule of these empires, for example Jews and Christians in Persia and Jews and Monophysites in Syria, were dissatisfied and sometimes even welcomed the Muslim forces, largely because of religious conflict in both empires.
Simplified: Moreover, many of the peoples living under the rule of these empires, for example Jews and Christians in Persia and Monophysites in Syria, were disloyal and sometimes even welcomed the Arab invaders, largely because of religious conflict in both empires.