Complex sentence: Between 1717 and 1721 George Sorocold built Britain's first mill for the Lombe brothers, beside the River Derwent to house machines for "doubling" or twisting silk into thread.
Split into simpler sentences: Between 1717 and 1721 George Sorocold built Britain's first mill for the Lombe brothers, beside the River Derwent. This mill was built to house machines for "doubling" or twisting silk into thread.