Complex sentence: The Dutch from their trading outpost of Fort Orange, established in 1624, traded with both native groups in the area and the Pine Bush was an important source for the natives to find firewood and animal pelts to trade with the Dutch.
Split into simpler sentences: The Dutch from their trading outpost of Fort Orange, established in 1624, traded with both native groups in the area. The Pine Bush was, for the natives, an important source of firewood and animal pelts to trade with the Dutch.