Complex sentence: The season itself is broken into two halves, with the winners of each half in each of the two divisions meeting first in a playoff to determine a divisional champion; the divisional champions then meet in a playoff for the league championship.
Split into simpler sentences: The season itself is broken into two halves, with the winners of each half in each of the two divisions meeting first in a playoff to determine a divisional champion. The divisional champions then meet in a playoff for the league championship.