Complex sentence: The band also played Glastonbury and the Roskilde festivals that summer and then a double album of B-sides, extra tracks, film tracks and sessions "Ooh Las Vegas" confirmed the band's status by reaching No.3 in the UK album charts.
Split into simpler sentences: The band also played Glastonbury and the Roskilde festivals that summer, as well as released a double album of B-sides, extra tracks, film tracks and sessions titled "Ooh Las Vegas". This seemed to confirm the band's eminent status by reaching No.3 in the UK album charts.