Complex sentence: Work on establish an administration was initiated by Adolf Erik Nordenskiöld in 1871, in which he, after contacting the invested governments, concluded that only Russia and Norway would object to an annexation of the island.
Split into simpler sentences: Work on establish an administration was initiated by Adolf Erik Nordenskiöld in 1871. After contacting the invested governments, he concluded that only Russia and Norway would object to an annexation of the island.