Complex sentence: On his return to Altona, the Duke of Augustenburg engaged him as teacher to three of his daughters, and when the Schleswig-Holstein war broke out, in 1849, Gurlitt became a military band master.
Split into simpler sentences: On his return to Altona, the Duke of Augustenburg engaged him as teacher for three of his daughters. When the Schleswig-Holstein war broke out in 1849, Gurlitt became a military band master.