Complex sentence: The album's title track was only performed a handful of times in 1975 and never played again after that, while several other tracks on the album were performed regularly for the rest of the Dead's career.
Split into simpler sentences: The album's title track was only performed a handful of times in 1975 and never played again after that. This is interesting in light of that most of the tracks on the album were performed for the rest of the Dead's career.