Complex sentence: The vast majority of the original bridge still exists, used as fishing piers and access to Pigeon Key, but the swing span over the Moser Channel of the Intracoastal Waterway has been removed.
Split into simpler sentences: The vast majority of the original bridge still exists. As for the longer section beyond Pigeon Key, the swing span over the Moser Channel of the Intracoastal Waterway has been removed.