Complex sentence: His high school band director was Perry Alton Sandifer (1910-2009), a trombonist, saxophonist, and clarinetist who, outside of school, performed in orchestras with his brothers, Sandy and Cody, and led a dance orchestra bearing his name.
Split into simpler sentences: His high school band director was Perry Alton Sandifer (1910-2009), a trombonist, saxophonist, and clarinetist. Outside of school, Sandifer performed in orchestras with his brothers, Sandy and Cody, and led led a dance orchestra bearing his name.