Complex sentence: It reached number four in Australia and Canada, while peaking at number five on the U.S. pop chart in January, becoming one of Newton-John's last big hits was her last Top 5 on the "Billboard Hot 100".
Split into simpler sentences: It reached number four in Australia and Canada, while peaking at number five on the U.S. pop chart in January, becoming one of Newton-John's last big hits. The track was her last Top 5 on the "Billboard Hot 100".