Original sentence: According to Bernard Lewis, the immigrats from Mecca were economically uprooted.Being in a state of war of with Mecca, they turned into the only remaining profession: taking up arms.Being viewed as a natural and legitimate act of war, they raided the Meccan caravans for two purposes, Lewis says: Putting pressure on the Mecca by blocking the trade roots, and acquiring power, prestigue and wealth.There was fighting in Yathrib mainly involving its Arab and Jewish inhabitants for around a hundred years before 620.They did not want to be wholly dependent on the Medinian
Edited sentence: In Medina, Muhammad signed treaties of alliance and mutual help with neighboring tribes.Mecca declared its hostility and status of war with the Muslims.Relations between Mecca and Medina rapidly worsened (see surat al-Baqara), as Muhammad and the Muslims who had immigrated from Mecca were economically uprooted.There was fighting in Yathrib mainly involving its Arab clans, Banu Aus and Banu Khazraj for around a hundred years before 620