Complex sentence: An additional ten were rebuilt from the tank version of the A B--the W AB class--between 1947 and 1957, while another two North British-made locomotives were built, but were lost in the wreck of the in May 1922.
Split into simpler sentences: An additional ten were rebuilt from the tank version of the A B--the W AB class--between 1947 and 1957. Two North British-made locomotives were lost in the wreck of the in May 1922.