Complex sentence: The delegates considered re-nominating Vice President Charles Dawes to be Hoover's running mate, but Coolidge, who hated Dawes, remarked that this would be "a personal affront" to him.
Split into simpler sentences: The delegates considered re-nominating Vice President Charles Dawes to be Hoover's running mate. But Coolidge, who hated Dawes, remarked that this would be "a personal affront" to him.