Complex sentence: Peary also relied on the Inuit as hunters and dog-drivers on his expeditions, and pioneered the use of the system (which he called the "Peary system") of using support teams and supply caches for Arctic travel.
Split into simpler sentences: Peary also relied on the Inuit as hunters and dog-drivers on his expeditions. He pioneered the system (which he called the "Peary system") of using support teams and supply caches for Arctic travel.