Complex sentence: The band co-headlined the "Everything's Fine Symphony Soldier" tour during January and February 2012 with best friends The Summer Set, with supporting acts He Is We, Days Difference, and Paradise Fears.
Split into simpler sentences: The band co-headlined the "Everything's Fine Symphony Soldier" tour during January and February 2012 with best friends The Summer Set. Supporting acts were He Is We, Days Difference, and Paradise Fears.