Complex sentence: Abandoning a concert career as a pianist he turned to popular music as a singer, and at the age of 23 he joined Mel Tormé's Mel-Tones, singing on Artie Shaw records such as "What Is This Thing Called Love".
Split into simpler sentences: Abandoning a concert career as a pianist, he turned to popular music as a singer. At the age of 23 he joined Mel Tormé's Mel-Tones, singing on Artie Shaw records such as "What Is This Thing Called Love".