Complex sentence: The abundance of water from the River Etherow and its tributaries led to mills being built in Longdendale and Glossopdale, and similarly along the River Wye in Millers Dale.
Split into simpler sentences: The abundance of water from the River Etherow and its tributaries, led to mills being built in Longdendale and Glossopdale. Similarly along the River Wye in Millers Dale.