Complex sentence: The new lineup released a second album, "In the Spirit of Things," in 1988, but it was met with weak sales and Morse left the band at the end of the tour in 1989.
Split into simpler sentences: The new lineup released a second album, "In the Spirit of Things," in 1988. In any event, the album suffered from weak sales and Morse left the band temporarily at the end of the tour in 1989.