Complex sentence: By 1948 the company had built more than 200 steam and electric winding engines and associated machinery for the home and export markets including a mine winder with a 34 feet diameter drum, 7 feet larger than the ones which made William Oliver move to new premises.
Split into simpler sentences: By 1948 the company had built more than 200 steam and electric winding engines and their associated machinery for both the home and export markets. Included in this was a mine winder with a 34 feet diameter drum, 7 feet larger than that which made William Oliver move to new premises.