Complex sentence: As they were intended for an underground railway, the locomotives did not have cabs, but had a weatherboard with a bent-back top and the back plate of the bunker was raised to provide protection when running bunker first.
Split into simpler sentences: As they were intended for an underground railway, the locomotives did not have cabs, but had a weatherboard with a bent-back top. The back plate of the bunker was raised to provide protection when running bunker first.