Original sentence: The controversy remains potent in modern times, both Greeks and Macedonian Slavs claim Alexander as their own national hero, and take great offense when he is described as belonging to the other nation
Edited sentence: Both Greek and Macedonian nationalists have claimed Alexander as their own national hero, and take great offense when he is described as belonging to the other nation.The controversy remains potent in modern times, because the area corresponding to Ancient Macedon is now divided between the modern state of Greece and the former Yugoslav Republic of Macedonia