Complex sentence: The no.1A boiler had a larger superheater than the Class 19B and, in a break with prior custom, the ash pan and running boards were affixed to the locomotive frame instead of to the boiler to facilitate easier removal of the boiler for repairs.
Split into simpler sentences: The no.1A boiler had a larger superheater than the Class 19B. In a break with prior custom, the ash pan and running boards were affixed to the locomotive frame instead of to the boiler to facilitate easier removal of the boiler for repairs.