Complex sentence: Specialising in progressive rock, it was fronted by Dave Lewis from Northern Ireland, who went on to write "Happy To Be An Island In The Sun" that was recorded by and became an international hit for Demis Roussos.
Split into simpler sentences: Specialising in progressive rock, it was fronted by Dave Lewis from Northern Ireland. He went on to write "Happy To Be An Island In The Sun", that was recorded by Demis Roussos.