Complex sentence: Born in Santo Domingo, he was trained by Cristóbal Balenciaga and Antonio del Castillo; he became internationally known in the 1960s as one of the couturiers who dressed Jacqueline Kennedy.
Split into simpler sentences: Born in Santo Domingo, he was trained by Cristóbal Balenciaga and Antonio del Castillo. De la Renta became internationally known in the 1960s as one of the couturiers who dressed Jacqueline Kennedy.