Complex sentence: The concerts revitalised the band and the remaining tracks were put down in a matter of days on the band's return to England, in a disused cinema in Hitchin attractive to Smith because of its acoustics and ambience.
Split into simpler sentences: The concerts revitalised the band and the remaining tracks were put down in a matter of days on the band's return to England. The follow up tracks were completed in a studio in a disused cinema in Hitchin, attractive to Smith because of its acoustics and ambience.