Complex sentence: He was the nephew of Skookum Jim Mason and accompanied him on his search for his aunt Kate Carmackfrat face one of the first three claims in the Klondike, along with his uncle and George Carmack.
Split into simpler sentences: He was the nephew of Skookum Jim Mason and accompanied him on his search for his aunt Kate Carmack. He staked one of the first three claims in the Klondike, along with his uncle and George Carmack.