Complex sentence: The City of Prague Philharmonic Orchestra (Czech: "Filharmonici města Prahy") is a professional, philharmonic symphony orchestra, over 61 years old, predominantly it is composed of Czech and Slovak classical and jazz musicians.
Split into simpler sentences: The City of Prague Philharmonic Orchestra (Czech: "Filharmonici města Prahy") is a professional philharmonic symphony orchestra. It is predominantly composed of Czech and Slovak classical and jazz musicians.