Complex sentence: As a result Persian influence along the Hellespont was significantly reduced, this served the dual goal of denying Persian land forces access to the Greek mainland while restoring Athenian trade to Black Sea ports such as Byzantium.
Split into simpler sentences: As a result, Persian influence along the Hellespont was significantly reduced. This served the dual goal of denying Persian land forces access to the Greek mainland, while restoring Athenian trade to Black Sea ports such as Byzantium.