Complex sentence: Some may notice that the odds of matching "only" the Powerball (1--35) are 1:55.41, instead of 1:35, as there is the possibility of matching at least one white ball "in addition" to the Powerball.
Split into simpler sentences: Some may notice that the odds of matching "only" the Powerball (1--35) are 1:55.41, instead of 1:35. This is because there is a chance of matching at least one white ball "in addition" to the Powerball.