Complex sentence: In 2005, Hilton was signed to Warner Bros. Records for distribution of her album and began working with Rob Cavallo, who had produced tracks for Green Day, Jewel, and Alanis Morissette.
Split into simpler sentences: In 2005, Hilton was signed to Warner Bros. Records for distribution of her album. At that time, Hilton began working with Rob Cavallo, who had produced tracks for Green Day, Jewel, and Alanis Morissette.