Complex sentence: In the 19th century, Sheffield gained an international reputation for steel production and was known as the Steel City Many innovations were developed locally, including crucible and stainless steel, fuelling an almost tenfold increase in the population in the Industrial Revolution.
Split into simpler sentences: In the 19th century, Sheffield gained an international reputation for steel production. Known as the Steel City, many innovations were developed locally, including crucible and stainless steel, fuelling an almost tenfold increase in the population in the Industrial Revolution.