Complex sentence: Rudi and Sandecker analyze their samples and find that the contamination is heading down the Niger River to the ocean, but they can't get any government help to intervene during a civil war in a sovereign country.
Split into simpler sentences: Rudi and Sandecker analyze their samples and find that the contamination is heading down the Niger River to the ocean. But, they can't get any government help to intervene during a civil war in a sovereign country.