Simplify the following text for a Grade 11 native English-speaking person.
Original: The song has since become a major worldwide hit , and along with the United States it has topped the charts in more than 20 countries , including Canada , Sweden , Australia , United Kingdom , New Zealand , Italy , Germany , and Ireland .
Simplified: The song has since become a major worldwide hit , and along with the United States , it has topped the charts in more than 20 countries , including Australia , Canada , Ireland and the United Kingdom .