Complex sentence: Dylan neglected "Pledging My Time" for over two decades, but in 1987 he revived it along with several other songs he had never performed live for a series of six concerts with The Grateful Dead.
Split into simpler sentences: Dylan neglected "Pledging My Time" for over two decades. In 1987 he revived the song along with several others he had never performed live in a series of six concerts with The Grateful Dead.