Complex sentence: Their most recent collaboration came on the song "Permanent" for David Cook's self titled album David Cook.Also, she helped write a song called "Gardenia" which appears on Mandy Moore's 2007 album Wild Hope.
Split into simpler sentences: Their most recent collaboration came on the song "Permanent" for David Cook's self titled album David Cook. She also helped write a song called "Gardenia" which appears on Mandy Moore's 2007 album Wild Hope.