Complex sentence: She was selected for the 1960 Summer Olympics in Rome in the 4 × 100 m freestyle, where she swam the heat but was not used in the final, in which Australia won the silver medal.
Split into simpler sentences: She was selected for the 1960 Summer Olympics in Rome in the 4 × 100 m freestyle. She swam the heat but was not used in the final, where Australia won the silver medal.