Complex sentence: The band were on the main stage for the entirety of the 2016 Vans Warped Tour, announcing that this would be their last tour before they headed into the studio to record their sixth studio album, scheduled for release in 2017.
Split into simpler sentences: The band were on the main stage for the entirety of the 2016 Vans Warped Tour. They have said this is their last tour before they head into the studio to record their sixth studio album, scheduled for release in 2017.