Complex sentence: Four four-wheeled passenger carriages were supplied to the railway by the Ashbury Railway Carriage and Iron Company Ltd of Manchester, four on opening with a further two supplied by the GWR in 1878 to meet traffic needs.
Split into simpler sentences: Four four-wheeled passenger carriages were originally supplied to the railway by the Ashbury Railway Carriage and Iron Company Ltd of Manchester. A further two were supplied by the GWR in 1878 to meet traffic needs.