Complex sentence: DJ Burn One has expanded from a traditional DJ to producer, and A&R and has been referred to as a "catalyst for not just the songs, but musical careers paths of artists" such as Gucci Mane, Yelawolf, Pill, and Freddie Gibbs.
Split into simpler sentences: DJ Burn One has expanded from a traditional DJ to producer and A&R. He has been referred to as a "catalyst for not just the songs, but musical careers paths of artists" such as Gucci Mane, Yelawolf, Pill, and Freddie Gibbs.