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 a twig so it was the same length as his forearm.
( He ( ( ( snapped ( a twig ) ) ( so ( it ( was ( ( the ( same length ) ) ( as ( his forearm ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (PRP He)) (VP (VBD snapped) (NP (DT a) (NN twig)) (SBAR (IN so) (S (NP (PRP it)) (VP (VBD was) (NP (NP (DT the) (JJ same) (NN length)) (PP (IN as) (NP (PRP$ his) (NN forearm)))))))) (. .)))