Complex sentence: Because the game counted in the final standings, the loser would finish third, behind Green Bay; further, the league had to make a rule change to allow the game, since they had banned the practice in 1924.
Split into simpler sentences: Because the game counted in the final standings, the loser would finish third, behind Green Bay. The league had to make a rule change to allow the game, since they had banned the practice in 1924.