Complex sentence: In 2003, after a seven-year sabbatical, the band returned to a full schedule, with bassist Lou Spagnola replacing Joe Holaday, who by then was working with the Beatles tribute band Beatle Juice.
Split into simpler sentences: In 2003, after seven years of part-time duty, the band returned to a full schedule. Bassist Lou Spagnola had replaced Joe Holaday, who by then was working with the Beatles tribute band Beatle Juice.