Complex sentence: At the 2004 Summer Olympics in Athens, he won a gold medal in the 100 m freestyle and two silvers in the 200 m freestyle and the 4 × 100 m freestyle relay, swimming the anchor leg in 46.79 which was the 2nd fastest split in history.
Split into simpler sentences: At the 2004 Summer Olympics in Athens, he won a gold medal in the 100 m freestyle and two silvers in the 200 m freestyle and the 4 × 100 m freestyle relay. He swam an anchor leg of 46.79 in the 4 × 100 m freestyle relay which was the 2nd fastest split in history.