Complex sentence: The references are to Selsey Bill although most of the holiday facilities are the other side of Selsey, the old, "Pontins holiday camp" at "Broadreeds", now redeveloped, was the only site that was near to "the Bill".
Split into simpler sentences: The references are to Selsey Bill although most of the holiday facilities are the other side of Selsey. The old, Pontin's holiday camp at "Broadreeds", now redeveloped, was the only site that was near to "the Bill".