Complex sentence: The locomotives that comprised the Northern Counties Committee Class B3 were rebuilds of two classes of BNCR "Light Compounds" that had been built by Beyer-Peacock in the 1890s to the design of the BNCR Locomotive Engineer Bowman Malcolm.
Split into simpler sentences: The locomotives that comprised the Northern Counties Committee Class B3 were rebuilds of two classes of BNCR "Light Compounds". These had been built by Beyer-Peacock in the 1890s to the design of the BNCR Locomotive Engineer Bowman Malcolm.