Complex sentence: "Downtown" debuted at number 25 on the U.S. "Billboard" Country Airplay chart for the week of February 9,2013, making it the highest chart debut of their career to date.
Split into simpler sentences: Downtown debuted at number 25 on the U.S. "Billboard" Country Airplay chart for the week of February 9,2013. It is the highest chart debut of their career to date.