Complex sentence: "White Flag", which features on her second album "Life For Rent", is about their split and remains Dido's biggest hit single in the USA to date, and her only one to reach the Top 10 of the Billboard Hot 100.
Split into simpler sentences: White Flag, which features on her second album "Life For Rent", is about their split. It remains Dido's biggest hit single in the USA to date, and her only one to reach the Top 10 of the Billboard Hot 100.