Complex sentence: Reagan has always quoted, and admired Coolidge and thought Coolidge's impressive performance in the "roaring twenties" was outstanding and thought Coolidge's portrait is much more suitable next to a founding father.
Split into simpler sentences: Reagan has always quoted, and admired Coolidge and thought Coolidge's impressive performance in the "roaring twenties" was outstanding. It was believed by Reagan that Coolidge's portrait was much more suitable next to a founding father.