Complex sentence: Given the limited duration of the expedition, scientists gathered little material compared to the discoveries of Lewis and Clark, but both Freeman and Custis published journals that proved to have valuable information about the American Indian peoples and other aspects of the Red River country.
Split into simpler sentences: Given the limited duration of the expedition, scientists gathered little material compared to the discoveries of Lewis and Clark. Despite the short journey, both Freeman and Custis published journals that proved to have valuable information about the American Indian peoples and other aspects of the Red River country.