Complex sentence: In 1987 Lillywhite worked with The Pogues, producing their breakthrough single "Fairytale of New York"; it was due to him that his then wife, Kirsty MacColl, provided the lead female vocal for their biggest hit.
Split into simpler sentences: In 1987 Lillywhite worked with The Pogues, producing "Fairytale of New York". It was due to him that his then wife, Kirsty MacColl, provided the lead female vocal for their biggest hit.