Complex sentence: The boatyard had to build a new hull and to do so, lofted the lines of the original boat that had been cut into three sections and transported to Barrow in Furness.
Split into simpler sentences: The boatyard had to build a new hull and to do so lofted the lines off the original boat. First the hull had to be reassembled as it had been cut into three sections in order to be transported to Barrow in Furness.