Complex sentence: The band's initial line up was as below, although there would be line up changes for the band by the time the came to work on their 3rd album, the first two members listed were a constant throughout the life time of the band.
Split into simpler sentences: The band's initial line-up was as below, although there would be changes by the time they came to work on their third album. The first two members listed were a constant throughout the lifetime of the band.