Complex sentence: In March 2016, Avenged Sevenfold held "March Mania"--a tournament to find the most fan loved Avenged Sevenfold song voted each week by fans.
Split into simpler sentences: In March 2016, Avenged Sevenfold held "March Mania". A tournament to find the most fan loved Avenged Sevenfold song voted each week by fans.