Complex sentence: The project could see reopening of the Neath Valley line through new stations at Neath Abbey, Jersey Marine, Neath and Aberdulais, an on-street connection from Swansea to Mumbles, and new stations via the existing Swansea to Cardiff route.
Split into simpler sentences: The project could see reopening of the Neath Valley Line through new Stations at Neath Abbey, Jersey Marine, Neath and Aberdulais. A proposed on street connection from Swansea to Mumbles, and new stations via the existing Swansea to Cardiff route.