Original: A total of 98 Class 33s were built by the Birmingham Railway Carriage and Wagon Company (BRCW) and were known as "Cromptons" after the Crompton Parkinson electrical equipment installed in them.
Simplified: A total of 98 class 33s were built by the Birmingham Railway Carriage and Wagon Company, and they were called "Cromptons" after the Crompton Parkinson electrical equipment installed in them.