Original sentence: Muhammad Ali is the only heavyweight champion to hold the lineal championship three times, beating Sonny Liston (1964), George Foreman in an comeback from a three-and-a-half year forced retirement (1974), and Leon Spinks in an upset by unanimous decision (1978)
Edited sentence: Muhammad Ali is the only heavyweight champion to hold the lineal championship three times, beating Sonny Liston (1964), George Foreman in an amazing comeback from a three-and-a-half year forced retirement (1974), and Leon Spinks in an upset by unanimous decision (1978)