Complex sentence: Under their Jarrahid chieftains, they established themselves in Palestine during Fatimid rule and as the virtually independent rulers of the area between al-Ramla and Jabal Tayy, they controlled the key routes between Egypt, Syria, Arabia and Iraq.
Split into simpler sentences: Under their Jarrahid chieftains, they established themselves in Palestine during Fatimid rule. As the virtually independent rulers of the area between al-Ramla and Jabal Tayy, they controlled the key routes between Egypt, Syria, Arabia and Iraq.