Complex sentence: It is located about five miles west of Chepstow and eleven miles east of Newport, and was originally founded by the Romans as the market town of "Venta Silurum", an important settlement of the Brythonic Silures tribe.
Split into simpler sentences: It is located about five miles west of Chepstow and eleven miles east of Newport. It was founded by the Romans as the market town of "Venta Silurum", an important settlement of the Brythonic Silures tribe.