Original: After working for the KGB, Theremin worked at the Moscow Conservatory of MusicGlinsky p. 341, "where Lev Sergeyevich had constructed musical instruments" for 10 years where he taught and built theremins, electronic cellos and some terpsitones (another invention of Theremin).
Simplified: After working for the KGB, Theremin worked at the Moscow Conservatory of MusicGlinsky 341, "where Lev Sergeyevich had constructed musical instruments" for 10 years where he taught and built Theremins, electronic cellos and some Terpsitones.