Complex sentence: From February to April 2009, the band participated in the Take Action 2009 tour, accompanying headliners Cute Is What We Aim For and opening acts Anarbor, Every Avenue, and Breathe Carolina.
Split into simpler sentences: From February to April 2009, the band participated in the Take Action 2009 tour. They accompanied headliners Cute Is What We Aim For and opening acts Anarbor, Every Avenue, and Breathe Carolina.