Complex sentence: Uninsky (pronounced "You-nin-skee") was born in Kiev, Uninsky initially studied piano there in the conservatory which had been opened in 1913, and whose other graduates included Horowitz and Brailowsky.
Split into simpler sentences: Uninsky (pronounced "You-nin-skee") was born in Kiev. He initially studied piano there in the conservatory which had been opened in 1913, and whose other graduates included Horowitz and Brailowsky.