Complex sentence: The song reached the top 10 in over eight countries, including the United States, where it peaked at number nine on the "Billboard" Hot 100 and became Perry's third top ten single, Canada, New Zealand, Ireland, Slovakia and others.
Split into simpler sentences: The song reached the top 10 in over eight countries, including the United States, where it peaked at number nine on the "Billboard" Hot 100 and became Perry's third top ten single. It also peaked in the top 10 in other countries including Canada, New Zealand, Ireland, Slovakia and others.