Complex sentence: When he was a child his parents moved from Mongolia to Ulan-Ude, Buryatia in Russia because his father was invited to Buryatia to invent National Buryatian Circus.
Split into simpler sentences: When he was a child his parents moved from Mongolia to Ulan-Ude, Buryatia in Russia. His father was invited to Buryatia to invent National Buryatian Circus.