Complex sentence: The Cities of Refuge were six Levitical towns in the Kingdom of Israel and the Kingdom of Judah in which the perpetrators of manslaughter could claim the right of asylum; outside of these cities, blood vengeance against such perpetrators was allowed by law.
Split into simpler sentences: The Cities of Refuge were six Levitical towns in the Kingdom of Israel and the Kingdom of Judah in which the perpetrators of manslaughter could claim the right of asylum. Outside of these cities, blood vengeance against such perpetrators was allowed by law.