Expanding the Big Ten Conference was difficult enough, but now comes the really hard part. Dividing up the Big Ten now that Nebraska has become its 12th team. Among the remaining items on the Big Ten?s fast-moving expansion agenda is splitting the conference into two divisions for football starting in 2011. There is no easy solution to the riddle of divisional placement and no one?s going to get exactly what they want, which is why the University of Wisconsin could end up being one of the key variables.