Complex sentence: During the World Magnetic Tour in 2009, "The Shortest Straw" made its way back into the setlist after a 12-year absence, and has subsequently become a permanent fixture in the band's setlist.
Split into simpler sentences: During the World Magnetic Tour in 2009, "The Shortest Straw" made its way back into the setlist after a 12-year absence. From that tour onwards, the song has become a permanent fixture in the band's setlist.