Complex sentence: The Flintshire Coalfield extends from the Point of Ayr in the north, through Connah's Quay to Caergwrle in the south and under the Dee Estuary to the Neston area of the Wirral Peninsula.
Split into simpler sentences: The Flintshire Coalfield extends from the Point of Ayr in the north, through Connah's Quay to Caergwrle in the south. It also extends under the Dee Estuary to the Neston area of the Wirral Peninsula.