怎么样化简表达式？

4 (x^2 - 1)/((x - 1) Sqrt[(x + 1)^2] (3 x + 2) + Sqrt[(x - 1)^2] (3 x^2 + x - 2))

Factor@PowerExpand[
  4 (x^2 - 1)/((x - 1) Sqrt[(x + 1)^2] (3 x + 2) + 
      Sqrt[(x - 1)^2] (3 x^2 + x - 2))]