Complex sentence: Claudio Villa recorded "Il tuo mondo", an Italian version of Tereza's "Nono" and Mireille Mathieu recorded the French version, "Pour deux coeurs qui s'aiment".
Split into simpler sentences: Claudio Villa recorded "Il tuo mondo". It is Italian version of Tereza's Nono and Mireille Mathieu recorded French version-- "Pour deux coeurs qui s'aiment".