Complex sentence: Prey possessed a clear, polished tone-darker and deeper-sounding than his slightly older contemporary Dietrich Fischer-Dieskau, but equally delicate and equally capable of soaring into the tenor range without the smallest suggestion of vocal effort.
Split into simpler sentences: Prey possessed a clear, polished tone-deeper and darker than his slightly older contemporary Dietrich Fischer-Dieskau, but equally delicate. At his best he could soar into the tenor range without the smallest suggestion of vocal effort.