Complex sentence: Issued only shortly after bebop had begun to establish itself, this recording offered an alternative aesthetic that was initially unpopular--it originally sold poorly and the band did not last long--but slowly established itself as a jazz classic.
Split into simpler sentences: Issued only shortly after bebop had begun to establish itself, this recording offered an alternative aesthetic that was initially unpopular. It sold poorly and the band did not last long, but it eventually became a jazz classic.