Complex sentence: Other Osage had taken trips to France and Washington, D.C. in the past, to enrich themselves.While leaving St.Louis, the raft wrecked causing them to lose all their furs, and half of the Osage decided to return back to their village.
Split into simpler sentences: Other Osage had previously taken trips to France and Washington, D.C., to enrich themselves. Whilst leaving St.Louis, their raftwas wrecked causing them to lose all their furs, and half of the Osage decided to return back to their village.