Simplify the following text for a Grade 18 native English-speaking person.
Original: As the city changed its name in the 20th century , the conservatory was renamed Petrograd Conservatory ( Ð Ð Ñ Ñ Ð 3\/4 Ð Ñ Ð Ð Ñ Ð Ð Ñ Ð Ð 3\/4 Ð 1\/2 Ñ Ð Ñ Ð Ð Ñ Ð 3\/4 Ñ Ð Ñ ) and then the Leningrad Conservatory ( Ð Ð Ð 1\/2 Ð Ð 1\/2 Ð Ñ Ð Ð Ñ Ð Ð Ñ Ð Ð 3\/4 Ð 1\/2 Ñ Ð Ñ Ð Ð Ñ Ð 3\/4 Ñ Ð Ñ ) .
Simplified: As the city changed its name in the 20th century , the conservatory was duly renamed Petrograd Conservatory ( Ð Ð Ñ Ñ Ð 3\/4 Ð Ñ Ð Ð Ñ Ð Ð Ñ Ð Ð 3\/4 Ð 1\/2 Ñ Ð Ñ Ð Ð Ñ Ð 3\/4 Ñ Ð Ñ ) and Leningrad Conservatory ( Ð Ð Ð 1\/2 Ð Ð 1\/2 Ð Ñ Ð Ð Ñ Ð Ð Ñ Ð Ð 3\/4 Ð 1\/2 Ñ Ð Ñ Ð Ð Ñ Ð 3\/4 Ñ Ð Ñ ) .