Complex sentence: The tracks were taken from the aforementioned cassette album and remixed (apparently from the very cassette at the Backstreet/Backlash Studio in Rotterdam), and this would prove to be the band's final release in their initial incarnation.
Split into simpler sentences: The tracks were taken from the aforementioned cassette album and remixed (apparently from the very cassette at the Backstreet/Backlash Studio in Rotterdam). This would prove to be the band's final release in their initial incarnation.