Complex sentence: When he finally limps back into the fort he is delirious and severely traumatized; none of the remaining soldiers (who did not meet Colqhoun) believe his wild tale, and a second expedition finds no bodies or any trace of the man.
Split into simpler sentences: When he finally limps back into the fort he is delirious and severely traumatized; none of the remaining soldiers (who did not meet Colqhoun) believe his wild tale. A second expedition finds no bodies or any trace of the man.