Complex sentence: In the 1990's he started teaching and served as ballet master of Ballet Concierto de Puerto Rico in 2004 he became the artistic director of the National Ballet Theater of Puerto Rico in San Juan.
Split into simpler sentences: In the 1990's he started teaching and served as ballet master of Ballet Concierto de Puerto Rico. In 2004 he became the artistic director of the National Ballet Theater of Puerto Rico in San Juan.