Complex sentence: Born in Montevideo Montevideo where he spent the first 20 years and obtained his basic music education and early concert experience, he moved to the USA (California) in 1978 fleeing the Dirty War of Uruguay's repressive military government.
Split into simpler sentences: Born in Montevideo, he spent the first 20 years of his life and obtained his basic music education and early concert experience here. In 1978 he moved to the USA (California) as a result of the Dirty War of Uruguay's repressive military government.