Complex sentence: The Amarillo Symphony Orchestra premiered Bright's "Symphonic Dance" in 1951, and his Symphony in E minor on March 24,1959; both were conducted by that ensemble's music director, A. Clyde Roller.
Split into simpler sentences: The Amarillo Symphony Orchestra premiered Bright's "Symphonic Dance" in 1951, and his Symphony in E minor on March 24,1959. Both were conducted by that ensemble's music director, A. Clyde Roller.