Complex sentence: From 1864 to 1866, the trail was traversed by about 3,500 miners, emigrant settlers and others, who competed with the Indians for the diminishing resources near the trail.
Split into simpler sentences: From 1864 to 1866, the trail was traversed by about 3,500 miners, emigrant settlers and others. The emigrants competed with the Indians for the diminishing resources near the trail.