Complex sentence: After the fall of the Roman Empire, the region of Apulia fell under the rule of the Byzantine Empire and during the nineth century, spelled a troubling time of zealous Christian missionary effort for the region's Jews.
Split into simpler sentences: After the fall of the Roman Empire, the region of Apulia fell under the rule of the Byzantine Empire and during the nineth century. This opened a troubling time of zealous Christian missionary effort for the region's Jews.