Complex sentence: Greg Holden is a New York-based British singer-songwriter best known for his hit charity single "The Lost Boy" and for co-writing "Home", the 2012 multi-platinum debut single for American Idol winner Phillip Phillips.
Split into simpler sentences: Greg Holden is a New York-based British singer-songwriter. He is best known for his hit charity single "The Lost Boy" and for co-writing "Home", the 2012 debut single for "American Idol"-winner Phillip Phillips.