Complex sentence: In June 2007, "Billboard" mMagazine created the Canadian Hot 100, a chart specifically designed for Canada and the first Hot 100 chart that "Billboard" created a for a country outside the United States.
Split into simpler sentences: In June 2007, "Billboard Magazine" created the Canadian Hot 100, a chart specifically designed for Canada. It marked the first time that "Billboard" created a Hot 100 chart for a country outside the United States.