Complex sentence: Hinkle himself acknowledged that Nagurski was a more powerful runner than he was, however, there is a story that Hinkle once hit Nagurski so hard that Nagurski suffered two cracked ribs and a broken nose.
Split into simpler sentences: Hinkle himself acknowledged that Nagurski was a more powerful runner than he was. However, there is a story that Hinkle once hit Nagurski so hard that Nagurski suffered two cracked ribs and a broken nose.