His sentence: I was delighted with the procession of the inhabitants; but that of the Thraciams was equally, if not more, beautiful.
From Plato's Republic
Plato's compound sentence is separated by a semicolon and a conjunction. The phrase "if not more," which qualifies the adverb equally, is set off by commas and solidifies the speaker's opinion.
My sentence: I was happy that she escaped the accident unscathed; but the policeman was too forgiving, if not entirely remissive, of her crime.