Complex sentence: Ian Welch of the Mainline Steam Heritage Trust purchased K 911, the most complete of the hulks, while Steam Incorporated purchased K 917, paired with the tender from K 928, as a potential spare boiler for K A 945.
Split into simpler sentences: Ian Welch of the Mainline Steam Heritage Trust purchased K 911, the most complete of the hulks. While Steam Incorporated purchased K 917, paired with the tender from K 928, as a potential spare boiler for K A 945.