Complex sentence: He finished his formal education in Europe, a common destination for a young American composer in the 1880s, where he studied in Munich with Josef Rheinberger; also in Munich he composed his first significant works, including a symphony and a dramatic cantata.
Split into simpler sentences: He finished his formal education in Europe, a common destination for a young American composer in the 1880s, where he studied in Munich with Josef Rheinberger. In Munich Parker composed his first significant works, including a symphony and a dramatic cantata.