Complex sentence: "Mad World" was originally written on acoustic guitar when Orzabal was 19 after being inspired to write a new wave song in the vein of Duran Duran's "Girls on Film".
Split into simpler sentences: Mad World was originally written on acoustic guitar when Orzabal was 19. It was a deliberate attempt to write something in the vein of Duran Duran's "Girls on Film".