 Complete the following phrase:  For a five-year period starting in 2015, the J.League changed to a newly conceived multistage system, with the year split into two halves and a third and final championship stage. The winners of the first and second stages and the highest ranking club of the aggregate table other than the first or second stage winners will qualify for the Championship Stage. Sanfrecce Hiroshima won the Championship Stage and advanced to the 