Complex sentence: Private recordings made in the 1950s are a much better indication of what he really sounded like, the voice being warm and round, as he was! he was a true bass, being able to sing bottom Bb with ease.
Split into simpler sentences: Private recordings made in the 1950s are a much better indication of what he really sounded like, the voice being warm and round. He was a true bass, being able to sing bottom Bb with ease.