Complex sentence: They were strong supporters of big business and Wall Street; many Republicans of the Eisenhower-Rockefeller vein were major figures in business, such as auto executive George W. Romney and investment banker C. Douglas Dillon.
Split into simpler sentences: They were strong supporters of big business and Wall Street. Many Republicans of the Eisenhower-Rockefeller vein were major figures in business, such as auto executive George W. Romney and investment banker C. Douglas Dillon.