Original sentence: Boone needs a transfusion of type A-negative.Flashbacks show both the build-up to, and the event of Jack's wedding to Sarah, a former patient whom he "fixed" (her words) after she was injured in a car accident.The character of Jack Shephard is featured in the episode's flashbacks
Edited sentence: Boone has lost a lot of blood and needs a transfusion of type A-negative.In flashbacks, we see both the build-up to, and the event of Jack's wedding to Sarah, a former patient whom he "fixed" (her words) after she was injured in a car accident.The character of Jack Shephard is featured in the episode's flashback