Complex sentence: By the 1970s, the term had turned into offensive slang and had expanded its meaning to mean bigoted, loutish and opposed to modern ways, and was often used as a term to attack Southern white conservatives and racists.
Split into simpler sentences: By the 1970s, the term had become offensive slang, and its meaning had expanded to mean bigoted, loutish, and opposed to modern ways. It was often used as a term to attack Southern white conservatives and racists.