Complex sentence: The Official International Queen Fan Club is the official fan club for the rock band Queen based in London, it was set up in 1973 by Pat and Sue Johnstone shortly after the release of the band's first album.
Split into simpler sentences: The Official International Queen Fan Club is the official fan club for the rock band Queen. Based in London, it was founded in 1973 by Pat and Sue Johnstone shortly after the release of the band's first album.