Complex sentence: Japanese Canadians are not a large section of the population in 2001 there were 85,230 (about 26,000 of whom are of mixed heritage), making them about the thirtieth largest ethnic group in Canada.
Split into simpler sentences: Japanese Canadians are not a large section of the population. In 2001 there were 85,230 (about 26,000 of whom are of mixed heritage), making them about the thirtieth largest ethnic group in Canada.