Complex sentence: His grandfather Budd Johnson was a saxophonist and his great-uncle Keg Johnson was a trombonist, and both are remembered for their contributions to the Bebop era of jazz.
Split into simpler sentences: His grandfather Budd Johnson was a saxophonist, and his great-uncle, Keg Johnson, was a trombonist. Both of them are remembered for their contributions to the Bebop era of jazz.