Complex sentence: Reports indicate that native species are still rare in many of the areas under study; for example, a 2006 report on 83 habitat areas in the Yampa River, which sampled 14,140 fish, reported only 1.6% of that total (221 fish) were native.
Split into simpler sentences: Reports indicate that native species are still rare in many of the areas under study. For example, a 2006 report on 83 habitat areas in the Yampa River, which sampled 14,140 fish, reported only 1.6% of that total (221 fish) were native.