Complex sentence: Over the course of two years, Wainwright and Brion recorded 56 songs on 62 rolls of tape at a cost that exceeded $700,000, which was then narrowed down to twelve tracks for the album.
Split into simpler sentences: Over the course of two years, Wainwright and Brion recorded 56 songs on 62 rolls of tape at a cost that exceeded $700,000. These were then narrowed down to twelve tracks for the album.