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 was feeling young and spry.
( Jon ( ( was ( feeling ( ( young and ) spry ) ) ) . ) )
(ROOT (S (NP (NNP Jon)) (VP (VBD was) (VP (VBG feeling) (ADJP (JJ young) (CC and) (JJ spry)))) (. .)))