Complex sentence: She swam for the gold medal-winning U.S. team in the preliminary heats of the women's 4x100-meter freestyle relay, but did not receive a medal under the 1964 international swimming rules because she did not compete in the event final.
Split into simpler sentences: She swam for the gold medal-winning U.S. team in the preliminary heats of the women's 4x100-meter freestyle relay. She did not receive a medal under the 1964 international swimming rules because she did not compete in the event final.