Original sentence: Parthian control broke the tenuous link with Greeks in the West that had sustained the Hellenistic kingdom of Greco-Bactria, yet Mithridates I actively promoted Hellenism in the areas he controlled and titled himself Philhellene ("friend of the Greeks") on his coins.The coins minted during his reign show the first appearance on Parthian coinage of a Greek-style portrait showing the royal diadem, the standard Greek symbol for kingship
Edited sentence: Parthian control broke the tenuous link with Greeks in the West that had sustained the Hellenistic kingdom of Greco-Bactria, yet Mithridates I actively promoted Hellenism in the areas he controlled and titled himself Philhellene ("friend of the Greeks") on his somewhat primitive coins: they show the first appearance on Parthian coins of a Greek-style portrait showing the royal diadem, the standard Greek symbol for kingship