Complex sentence: The band's main patrons at CBS Records had largely left the company by this time; their successful recent producer, Steve Lillywhite, was now basically unavailable to them; and even drummer Vince Ely's commitment to the band seemed to be in question.
Split into simpler sentences: The band's main patrons at CBS Records had largely left the company by this time, and their successful recent producer, Steve Lillywhite, was now basically unavailable to them. Even drummer Vince Ely's commitment to the band seemed to be in question.