Complex sentence: On December 9,2015, the band announced that they will take part in another tour as a supporting act for Blessthefall, alongside fellow acts Sirens & Sailors, Miss May I, and A War Within from February 20,2016 through March 21.
Split into simpler sentences: On December 9,2015 the band announced that they will take part in another tour as a supporting act. The Plot In You that they will serve as a supporting act for band Blessthefall alongside supportive acts Sirens & Sailors, Miss May I, and A War Within from February 20,2016 through March 21.