Complex sentence: Kilmer lasted one season as commissioner, working unpaid, during which he encountered numerous problems in the AFA, including a scandal in San Antonio which a player named Robert Lee Johnson misrepresented himself as former NFL lineman Randy Johnson.
Split into simpler sentences: Kilmer lasted one season with the league, working unpaid, during which he encountered numerous problems in the league. There was a scandal in San Antonio which a player named Robert Lee Johnson misrepresented himself as former NFL lineman Randy Johnson.