One he broke back to about the length of his forearm.
( One ( he ( ( ( broke back ) ( to ( ( about ( the length ) ) ( of ( his forearm ) ) ) ) ) . ) ) )
(ROOT (S (NP (PRP One)) (NP (PRP he)) (VP (VBD broke) (ADVP (RB back)) (PP (TO to) (NP (NP (RB about) (DT the) (NN length)) (PP (IN of) (NP (PRP$ his) (NN forearm)))))) (. .)))
He snapped it until it was just a couple of inches long.
( He ( ( ( snapped it ) ( until ( it ( ( ( was just ) ( ( a couple ) ( of inches ) ) ) long ) ) ) ) . ) )
(ROOT (S (NP (PRP He)) (VP (VBD snapped) (NP (PRP it)) (SBAR (IN until) (S (NP (PRP it)) (VP (VBD was) (ADVP (RB just)) (NP (NP (DT a) (NN couple)) (PP (IN of) (NP (NNS inches)))) (ADVP (RB long)))))) (. .)))