Complex sentence: On October 4,2015, the Powerball format changed again; the white-ball pool increased from 59 to 69 while the Powerball pool decreased from 35 to 26.
Split into simpler sentences: On October 4,2015, the Powerball format changed again. The white-ball pool increased from 59 to 69 while the Powerball pool decreased from 35 to 26.