It eliminates the times you uncontrollably think about a past event - note that voluntary recall isn't affected. So it's saying that this lets you process the t

It eliminates the times you uncontrollably think about a past event - note that voluntary recall isn't affected. So it's saying that this lets you process the trauma in a controlled environment when you're in a position to deal with it, but otherwise resume a life that isn't interrupted or dominated by it.