Original sentence: Holden Caulfield is one of the most enduring characters in 20th century American fiction, and one with which many teenagers and adults have identified—most famously in the case of Mark David Chapman, the murderer of John Lennon
Edited sentence: Holden Caulfield is one of the most enduring characters in 20th century American fiction, and one with which many teenagers and adults have identified - most tragically (albeit irrationally), perhaps, in the case of Mark David Chapman, the murderer of John Lennon