Complex sentence: His voice is heard on many television and radio spots across Africa, probably most notably in the recent past, on the "Coca Cola Popstars" television series on which he was the voice narrator (for three seasons).
Split into simpler sentences: His voice is heard on many television and radio spots across Africa. Probably most notably in the recent past, the "Coca Cola Popstars" television series on which he was the voice narrator (for three seasons).