Complex sentence: They supported Placebo in Europe and Australia, The Futureheads in the UK, Mercury Rev in Europe, Snow Patrol on their Australian tour, and The Killers in the US, Europe and Australia.
Split into simpler sentences: They supported Placebo in Europe and Australia, and The Futureheads in the UK. The band also supported Mercury Rev in Europe, Snow Patrol on their Australian tour, and The Killers in the US, Europe and Australia.