Simplify the following text for a Grade 10 native English-speaking person.
Original: In 1896 , he returned to Catalonia and received an appointment to the faculty of the Escola Municipal de MÃ sica in Barcelona . He was also appointed principal cellist in the orchestra of Barcelona 's opera house , the Liceu .
Simplified: In 1896 , he returned to Catalonia where he taught at a music school and played principal cellist in the orchestra of Barcelona 's opera house , the Liceu .