Original sentence: Byrd in 1926 (just a few days before the Norge) – are all disputed, as being either of dubious accuracy or outright fraud.Some of those disputing these earlier claims therefore consider the crew of the Norge to be the first verified explorers to have reached the North Pole.The three previous claims to have arrived at the North Pole – by Frederick Cook in 1908, Robert Peary in 1909, and Richard E
Edited sentence: Because the three previous claims to have arrived at the North Pole — by Cook in 1908, Robert Peary in 1909, and Richard Byrd in 1926 (just a few days before Norge) — are all either dubious or fraudulent, Amundsen and the crew of the Norge are the first verified explorers to have reached the North Pole