Complex sentence: Here they passed the winter, periodically hunting, fishing and trading with the local Inuit to extend their rations, while Rae explored the lands between the Mackenzie and Coppermine Rivers.
Split into simpler sentences: Here they passed the winter, periodically hunting, fishing and trading with the local Inuit to extend their rations. Throughout the winter Rae explored the lands between the Mackenzie and Coppermine Rivers.