Complex sentence: Following the Industrial Revolution, Saddleworth became a centre for cotton spinning and weaving during the 18th and 19th centuries, so much so that by the end of Queen Victoria's reign, mechanized textile production had become a vital part of the local economy.
Split into simpler sentences: Following the Industrial Revolution, in the 18th and 19th centurues, Saddleworth became a centre for cotton spinning and weaving. By the end of Queen Victoria's reign, mechanized textile production had become a vital part of the local economy.