Complex sentence: He appeared with the band on "Friday Night with Jonathan Ross" on November 9, then played both Foo Fighters dates at the O2 Arena, London on November 17 and 18,2007.
Split into simpler sentences: He appeared with the band on "Friday Night with Jonathan Ross" on November 9. He played both Foo Fighters dates at the O2 Arena, London on November 17 and 18,2007.