Complex sentence: King's creative output, since his release from prison, has been limited to self-producing feature films and LPs, and self-publishing books, and has been described as being, at times, "a primal scream of rage".
Split into simpler sentences: King's creative output, since his release from prison, has been limited to self-producing feature films and LPs, and self-publishing books. His output has been described as being, at times, "a primal scream of rage".