Original: The town largely grew in importance in the late 18th century when it was developed by the Dukes of Devonshire, with a second resurgence a century later as the Victorians were drawn to the reputed healing properties of the waters.
Simplified: The town largely grew in importance in the late 18th century when it was developed by the Dukes of Devonshire, with a second revival a hundred years later as the people visited to use the healing properties of the waters.