Complex sentence: They were called the "Old Right" to distinguish them from their New Right successors, such as Barry Goldwater, who came to prominence in the 1950s and 1960s and favored an interventionist foreign policy to battle international communism.
Split into simpler sentences: They were called the "Old Right" to distinguish them from their New Right successors. Among the latter were Barry Goldwater, who came to prominence in the 1950s and 1960s and favored an interventionist foreign policy to battle international communism.