Jon's feeling of age and weariness must have shown.
( ( ( ( Jon 's ) feeling ) ( of ( ( age and ) weariness ) ) ) ( ( must ( have shown ) ) . ) )
(ROOT (S (NP (NP (NP (NNP Jon) (POS 's)) (NN feeling)) (PP (IN of) (NP (NN age) (CC and) (NN weariness)))) (VP (MD must) (VP (VB have) (VP (VBN shown)))) (. .)))
Jon had traveled longer than his body could handle.
( Jon ( ( had ( traveled ( longer ( than ( ( his body ) ( could handle ) ) ) ) ) ) . ) )
(ROOT (S (NP (NNP Jon)) (VP (VBD had) (VP (VBN traveled) (ADVP (ADVP (RBR longer)) (SBAR (IN than) (S (NP (PRP$ his) (NN body)) (VP (MD could) (VP (VB handle)))))))) (. .)))