Improve the consistency in the paragraph.
Between March 1961 and the Clay fight, Liston had fought three times and won each bout with first-round knockouts --. That Liston had fought a total of just over six minutes during a 35-month stretch.
Between March 1961 and the Clay fight, Liston had fought three times and won each bout with first-round knockouts -- meaning that he had fought a total of just over six minutes during a 35-month stretch.