Complex sentence: Grigorian has enjoyed success on the concert platforms of France, Spain, Holland, Austria, Germany and former Yugoslavia, and appeared in cultural centers of the then Soviet Union such as Moscow, St. Petersburg, Kiev, Riga and Novosibirsk.
Split into simpler sentences: Grigorian has enjoyed success on the concert platforms of France, Spain, Holland, Austria, Germany and former Yugoslavia. He has appeared in cultural centers of the then Soviet Union such as Moscow, St. Petersburg, Kiev, Riga and Novosibirsk.