Complex sentence: In the later nineties, she released a compilation of demo recordings called "Demos Federico", from which a song was used as background for a 2011 episode of American Idol Season 10.
Split into simpler sentences: In the later nineties, she released a compilation of demo recordings called "Demos Federico". A song from these sessions was used as background for a 2011 episode of "American Idol" in Season 10.