Complex sentence: Its usage is similar to that of "kokujin" (black person) in the Japanese language, i.e. although the Japanese people may have negative stereotypes about blacks and use "kokujin" negatively, it is not meant to be taken as offensive.
Split into simpler sentences: Its usage is similar to that of kokujin (black person) in the Japanese language. Although the Japanese people may have negative stereotypes about blacks and use "kokujin" negatively, it is not meant to be taken as offensive.