Complex sentence: Additionally, Norway, which gained full independence from Sweden in 1905, challenged Danish claims to Greenland and supported the occupation of uninhabited eastern Greenland by the Norwegian whaler Hallvard Devold in 1931; in 1933 the Permanent Court of International Justice ruled in Denmark's favor.
Split into simpler sentences: Additionally, Norway, which gained full independence from Sweden in 1905, challenged Danish claims to Greenland and supported the occupation of uninhabited eastern Greenland by the Norwegian whaler Hallvard Devold in 1931. In 1933 the Permanent Court of International Justice ruled in Denmark's favor.