Simplify the following text for a Grade 12 native English-speaking person.
Original: In Europe and North America , Ulan Bator was generally known as Urga ( from Ã -- rgÃ Ã ) or sometimes Kuren ( from KhÃ 1\/4 ree ) or Kulun ( from å `` å `` , the Chinese transcription of KhÃ 1\/4 ree ) before 1924 , and Ulan Bator afterwards , after the .
Simplified: In Europe and North America , Ulan Bator was generally known as Urga ( from Ã -- rgÃ Ã ) or sometimes Kuren ( from KhÃ 1\/4 ree ) or Kulun ( from å `` å `` , the Chinese transcription of KhÃ 1\/4 ree ) before 1924 .