Complex sentence: Once his dental career had been established, taking the stage name of Jimmie Lee, he collaborated in 2004 with Grammy nominated music producer, David Ivory on pursuing a music career as a country rock artist.
Split into simpler sentences: Once his dental career had been established, he took the stage name of Jimmie Lee. He collaborated in 2004 with music producer David Ivory on pursuing a music career as a country-rock artist.