Complex sentence: With the fur trade in decline and increasing harassment from American settlers, tax collectors, and revenue agents, Fort Nisqually closed in 1869 and the United States paid the HBC $460,000 for its land.
Split into simpler sentences: With the fur trade in decline and increasing harassment from American settlers, tax collectors, and revenue agents. In 1869, Fort Nisqually closed and the United States paid the HBC $460,000 for its land.