Original sentence: From 1964 to 1983, Marshall's football program suffered a dismal streak of losing seasons, exacerbated by the 1970 plane crash and recruiting violations that cost the school membership in the Mid-American Conference
Edited sentence: From 1964 to 1983, Marshall's football program suffered a dismal streak of losing seasons, exacerbated by the 1970 plane crash -- the worst tragedy in college sports history -- and recruiting violations that cost the school membership in the Mid-American Conference