Complex sentence: After the fall of Dʿmt in the 5th century BC, the plateau came to be dominated by smaller successor kingdoms until the rise of one of these polities during the first century, the Kingdom of Aksum, which was able to reunite the area.
Split into simpler sentences: After the fall of Dʿmt in the 5th century BC, the plateau came to be dominated by smaller successor kingdoms. This lasted until the rise of one of these polities during the first century, the Kingdom of Aksum, which was able to reunite the area.