Complex sentence: Because the Red Shirts were primarily comprised of poor whites, the Democratic Party, of elitist whites parted their ways from the group, and so the prevalence of Red Shirts disappeared upon the inauguration of Governor Aycock Prather 1977.
Split into simpler sentences: Because the Red Shirts were primarily poor whites, the Democratic Party, of elitist whites, parted ways with the group. Thus the prevalence of Red Shirts declined upon the inauguration of Governor Aycock Prather 1977.