Simplify the following text for a Grade 13 native English-speaking person.
Original: Statistics South Africa provided five racial categories by which people could classify themselves , the last of which , `` unspecified\/other '' drew negligible responses , and these results were omitted .
Simplified: Statistics South Africa had five racial categories by which people could classify themselves , the last of which , `` unspecified\/other '' drew `` not needed '' responses , and these results were not sounted .