Complex sentence: The concert took place on the 18th September, during the hot summer of 1976, it was part of a brief summer tour of the UK by the band, they also played in Edinburgh and Cardiff on this tour.
Split into simpler sentences: The concert took place on the 18th September, during the hot summer of 1976. It was part of a brief summer tour of the UK by the band; they also played in Edinburgh and Cardiff on this tour.