Complex sentence: Orestes was free to issue new solidi in the mints of Arles, Milan, Ravenna and Rome, enabling him to pay the barbarian mercenaries who constituted most of the contemporary Roman Army.
Split into simpler sentences: Orestes was free to issue new Solidi in the mints of Arles, Milan, Ravenna and Rome. Thus he was able to pay the barbarian mercenaries who constituted most of the contemporary Roman Army.