Complex sentence: She went on to portray several more roles with the NYCO over the next thirteen years, including, Cherubino in "Le nozze di Figaro", Siebel in "Faust", and the title role in "Carmen".
Split into simpler sentences: She went on to portray several more roles with the NYCO over the next thirteen years. Other roles she sang at the NYCO inclduded Cherubino in "Le nozze di Figaro", Siebel in "Faust", and the title role in "Carmen".