Jon's defense began to weaken and slow.
( ( ( Jon 's ) defense ) ( ( began ( to ( ( weaken and ) slow ) ) ) . ) )
(ROOT (S (NP (NP (NNP Jon) (POS 's)) (NN defense)) (VP (VBD began) (S (VP (TO to) (VP (VB weaken) (CC and) (VB slow))))) (. .)))
Jon felt stronger and more defensive than ever. 
( Jon ( ( ( felt ( ( stronger and ) ( more defensive ) ) ) ( than ever ) ) . ) )
(ROOT (S (NP (NNP Jon)) (VP (VBD felt) (ADJP (ADJP (JJR stronger)) (CC and) (ADJP (RBR more) (JJ defensive))) (PP (IN than) (ADVP (RB ever)))) (. .)))