Black can spread over someone's skin and cried for losing rights all over the world in order to believe that blacks have equal right as whites, reds and yellows.
Ok, we don't call people reds and yellows, and rarely 'blacks' and 'whites' these days - It's impolite.Black can spread over someone's skin. I can't paraphrase this. If a person is black, they don't become black by 'spreading'. They are generally born black and stay that way, unless they're Michael Jackson. Black spreading across your skin signifies a melanoma - an aggressive skin cancer.
and cried for losing rights all over the world
There's not subject here, The way you have written it "Black" is the subject.
I think you mean someone is crying for not having rights - whether they lost rights or never had them in the first place.
in order to believe that blacks have equal right as whites, reds and yellows.
... so that they can believe that black people have the same rights as people of other races.
You possibly mean something like:
Black people cry/protest all over the world to gain the same rights as people of other races.