Complex sentence: The Russian spelling ("Улан-Батор") is Russian phonetic equivalent of Mongolian name according to Russian spelling conventions, this form was defined two decades before Mongolian name got its current Cyrillic script spelling and'Ulaanbaatar' transliteration (1941--1950).
Split into simpler sentences: The Russian spelling ("Улан-Батор") is the Russian phonetic equivalent of the Mongolian name, according to Russian spelling conventions. This form was defined two decades before the Mongolian name got its current Cyrillic script spelling and'Ulaanbaatar' transliteration (1941--1950).