Complex sentence: Historians have divided views on Stefansson's decision to leave the ship, and some of the voyage's survivors were critical of his seeming indifference to their ordeal and the loss of their comrades.
Split into simpler sentences: Historians have divided views on Stefansson's decision to leave the ship. Some of the voyage's survivors were critical of his seeming indifference to their ordeal and the loss of their comrades.