Complex sentence: The first, from Willing, announcing the doctor's safe arrival in Prescott and the second, informing Reavis of Willing's death, from the Yavapai County sheriff who had sent a letter to the only address in the doctor's papers.
Split into simpler sentences: The first, from Willing, announcing the doctor's safe arrival in Prescott. The second, informing Reavis of Willing's death, was from the Yavapai County sheriff who sent a letter to the only address in the doctor's papers.