Simplify the following text for a Grade 10 native English-speaking person.
Original: After the Russian Revolution the orchestra was taken over by its members , who changed the name to the `` State Philharmonic Orchestra of Petrograd '' .
Simplified: After the Russian Revolution the country no longer had a tsar . The town of Saint Petersburg changed its name to Petrograd , so the orchestra 's name changed to `` State Philharmonic Orchestra of Petrograd '' .