Complex sentence: He highlighted the "liberating presence" of bassist Billy Cox, whom he said was an improvement over Noel Redding, allowing the band to "spread out and chase the guitarist as he soars above, around and beneath them".
Split into simpler sentences: He highlighted the "liberating presence" of bassist Billy Cox, deeming him an improvement over Noel Redding. According to Murphy, Cox allowed the band to "spread out and chase the guitarist as he soars above, around and beneath them".