Complex sentence: These are visited by many in the surrounding area and thus have proved a popular tourist attraction, Alas unfortunately only one of these actually functions to generate electricity, as the others have fallen into disrepair and are now only for show.
Split into simpler sentences: These are visited by many in the surrounding are and have proved a popular tourist attraction. Unfortunately only one of these actually functions to generate electricity, as the others have fallen into disrepair and are now only for show.