Complex sentence: The name Squankum was used for a town in Gloucester County, which was changed to present day Williamstown (see note above), due to postal regulations that prohibited the two towns from having the same name.
Split into simpler sentences: The name Squankum was the name used for a town in Gloucester County, which was changed to present day Williamstown (see note above). This was due to postal regulations that prohibited the two towns from having the same name.