Complex sentence: However, in 2007, "Arches of Roses" was performed by a group of Seniors to bring the tradition back to Middlesboro High School, and in 2013, "Arches of Roses" once again became an integral part of the graduation ceremonies at MHS.
Split into simpler sentences: However, in 2007, "Arches of Roses" was performed by a group of Seniors to bring the tradition back to Middlesboro High School. In 2013, "Arches of Roses" once again became an integral part of the graduation ceremonies at MHS.