Original sentence: After the name was extended to all peoples south of Mount Olympus, however, it still left out those of common origin living in the north.At the time of the Trojan War, the Epirotes, Molossians and Macedonians were not considered Hellenes, for the people so named were then limited to a small tribe in Thessaly of which Achilles was a member.One factor contributing to this was their refusal to participate in the Persian Wars, which were considered a vital affair for all Hellenes; prior to the wars, representatives of these tribes had been accepted in the Olympic Games and competed alongside other Hellenes
Edited sentence: After the name was extended to all peoples south of Mount Olympus, however, it still left out those of common origin living in the north, mainly because of their stalwart & stagnant culture.Another factor contributing to this was their refusal to participate in the Persian Wars, which were considered a vital affair for all Hellenes; prior to the wars, representatives of these tribes had been accepted in the Olympic Games and competed alongside other Hellenes, which affirms their greekness because as a strict rule, only greeks could compete in these games.At the time of the Trojan War, the Epirotes, Molossians and Macedonians were not considered Hellenes, although they were of greeks by descent, for the people so named were then limited to a small tribe in Thessaly of which Achilles was a member