Complex sentence: He went on to perform in a large number of operas there, including Eugene Onegin (as Lenski), the title roles in Tannhäuser "and" Lohengrin ", and as Faust in" Mefistofele.
Split into simpler sentences: He went on to perform in a large number of operas there, including Eugene Onegin (as Lenski). He sang also the title roles in Tannhäuser "and" Lohengrin ", and appeared as Faust in" Mefistofele.