Complex sentence: The trip took from September and on into the winter from which he suffered a broken arm and near death in the snows of New Mexico, yet it left him enamored with the Southwest and its Spanish and Native American inhabitants.
Split into simpler sentences: The trip took from September and on into the winter. He suffered a broken arm and the heavy snows of New Mexico, yet the trip left him enamored with the Southwest and its Spanish and Native American inhabitants.