Complex sentence: Kardashian had let his license to practice law become inactive before the Simpson case but reactivated it to aid in Simpson's defense as a volunteer assistant on his legal team, alongside Simpson's main defense attorneys, Robert Shapiro and Johnnie Cochran.
Split into simpler sentences: Kardashian had let his license to practice law become inactive before the Simpson case. He reactivated his license to aid in Simpson's defense as a volunteer assistant on his legal team, alongside his main defense attorneys, Robert Shapiro and Johnnie Cochran.