Saya mau tau 1949–1956 dari Sony. Jelaskan dalam bahasa jawa

Thus in 1949, when the rest of the Dutch East Indies became fully independent as Indonesia, the Dutch retained sovereignty over western New Guinea, and took steps to prepare it for independence as a separate country. Some five thousand teachers were flown there. The Dutch put an emphasis upon political, business, and civic skills. On 8 February 1950 Stephan Lucien Joseph van Waardenburg was appointed the first Governor (De Gouverneur) of Dutch New Guinea. The first local naval cadets graduated in 1955 and the first army brigade become operational in 1956.