Complex sentence: He made his operatic debut in 1889 as Méphistophélès in a Hollandsche Opera production of Gounod's "Faust" and during the next two years continued singing leading roles with the company.
Split into simpler sentences: He made his operatic debut in 1889 as Méphistophélès in a Hollandsche Opera production of Gounod's "Faust". During the next two years he continued singing leading roles with the company.