Complex sentence: Towns and cities expanded as the workforce moved into the new industrial areas resulting in the building of more than 4,000 churches during the mid 19th century and an upsurge of nonconformism led to a demand for even more buildings.
Split into simpler sentences: Towns and cities expanded as the workforce moved into the new industrial areas, resulting in the building of more than 4,000 churches during the mid 19th century. An upsurge of nonconformism led to a demand for even more buildings.