Complex sentence: Before he was well-known he taught privately in Novosibirsk; since then he has taught at the Royal Academy of Music in London, the Conservatory of Rotterdam, the Musikhochschule Lübeck and the Escuela Superior de Música Reina Sofía in Madrid.
Split into simpler sentences: Before he was well-known he taught privately in Novosibirsk. Since then he has taught at the Royal Academy of Music in London, the Conservatory of Rotterdam, the Musikhochschule Lübeck and the Escuela Superior de Música Reina Sofía in Madrid.