Complex sentence: It claimed that they were "savages" who could not exercise political power over their land, and thus the land was claimed by Europeans who exercised control over the indigenous populations and began oil extraction without consent or compensation to the local peoples.
Split into simpler sentences: It claimed that they were "savages" who could not exercise political power over their land. Thus, the land was claimed by Europeans who exercised control over the indigenous populations and began oil extraction without consent or compensation to the local peoples.