Complex sentence: After choral and concert work he began his operatic repertoire career relatively late in life in 1948 by singing on Italian radio (RAI) and made his stage debut in 1952 at the San Carlo in Naples, where he was to performed regularly until 1980.
Split into simpler sentences: After choral and concert work he began his operatic repertoire career relatively late in life in 1948 by singing on Italian radio (RAI). He made his stage debut in 1952 at the San Carlo in Naples, where he was to performed regularly until 1980.