Complex sentence: He was both NWA and AWA heavyweight wrestling champion of the world a total of five separate times between 1938 and 1947, on one occasion he held the title for just a few weeks before being defeated.
Split into simpler sentences: He was both NWA and AWA heavyweight wrestling champion of the world a total of five separate times between 1938 and 1947. On one occasion he held the title for just a few weeks before being defeated.