Complex sentence: After residing in the United States for a year and eleven months, Koszta returned to Turkey on private business, and was placed under the protection of the United States by the American consul at Smyrna and the American chargé d'affaires "ad interim" at Constantinople.
Split into simpler sentences: After residing in the United States for a year and eleven months, Koszta returned to Turkey on private business. He was placed under the protection of the United States by the American consul at Smyrna and the American chargé d'affaires "ad interim" at Constantinople.