Complex sentence: The GWR 3511 class were standard gauge 2-4-0 side tank locomotives designed by William Dean and built in 1885 comprising the last ten of the twenty locomotives of Lot 64.
Split into simpler sentences: The GWR 3511 class were standard gauge 2-4-0 side tank locomotives designed by William Dean and built in 1885. They comprised the last ten of the twenty locomotives of Lot 64.