Complex sentence: Her single "Busy for Me", released in August 2010, became her first number one single, it topped the Portuguese iTunes chart and is credited with firmly establishing the singer's career and is now considered her signature song.
Split into simpler sentences: Her single "Busy for Me", released in August 2010, became her first number one single; it topped the Portuguese iTunes chart. This has been credited with firmly establishing the singer's career and is now considered her signature song.