Complex sentence: Matthew Lassiter argues that Nixon's appeal was not to the Wallace sites are segregationists, but rather to the rapidly emerging suburban middle-class, many with Northern antecedents, who wanted rapid economic growth and saw the need to put backlash politics to rest.
Split into simpler sentences: Matthew Lassiter argues that Nixon's appeal was not to the Wallacites or segregationists, but rather to the rapidly emerging suburban middle-class. Many had Northern antecedents; they wanted rapid economic growth and saw the need to put backlash politics to rest.