Complex sentence: From these were developed the standard six-wheeled, low elliptical roofed coaches which were built in their thousands around the 1880s, one variety alone, the diagram 15, five compartment, full 3rd class, numbered around a thousand.
Split into simpler sentences: From these were developed the standard six-wheeled, low elliptical roofed coaches which were built in their thousands around the 1880s. One variety alone, the diagram 15, five compartment, full 3rd class, numbered around a thousand.