Complex sentence: When Barr awakens from his coma, he tells Helen that he has no recent memory but believes that he must be guilty of the shooting and is willing to confess and accept punishment, fearing that Reacher will mete out justice if the law does not.
Split into simpler sentences: When Barr awakens from his coma, he tells Helen that he has no recent memory but believes that he must be guilty of the shooting. Still unknowing of all this, Barr is willing to confess and accept punishment, fearing that Reacher will mete out justice if the law does not.