Complex sentence: Rastafari is a response to racist negation of black people as it was experienced in Jamaica, where in the 1930s black people were at the bottom of the social order, while white people and their Christian religion were at the top.
Split into simpler sentences: Rastafari is a response to racist negation of black people. In Jamaica in the 1930s, black people were at the bottom of the racist social order, while white people and their Christian religion were at the top.