Complex sentence: Having been taught to play string instruments by a Czech music professor, he set about supervising the installation of St Barbara's original pipe organ; the church organ, which the great Chopin played, was destroyed by the Communists in the 20th century.
Split into simpler sentences: Having been taught to play string instruments by a Czech music professor, he supervised the installation of St Barbara's original pipe organ. Unfortunately the organ, which the great Chopin played, was destroyed by the Communists in the 20th century.