Complex sentence: There was a reunion concert with the original Chris Barber band in Croydon in June 1975--notable for a bomb scare, meaning that the recording had to be finished in the studio, though patrons were treated to an impromptu concert in the car park.
Split into simpler sentences: There was a reunion concert with the original Chris Barber band in Croydon in June 1975. A bomb scare meantat the recording had to be finished in the studio, after an impromptu concert in the car park.