Complex sentence: The "− 1/2" in the formula serves to break ties in favor of zeros when "n" is even; a similar formula can be used for a function that breaks ties in favor of ones.
Split into simpler sentences: The "− 1/2" in the formula serves to break ties in favor of zeros when "n" is even. If the term "− 1/2" is omitted, the formula can be used for a function that breaks ties in favor of ones.