( Joints ( ( have ( cartilage ( in ( between ( ( them , ) ( which ( help ( to ( make ( ( the movement ) flexible ) ) ) ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (NNS Joints)) (VP (VBP have) (VP (VBN cartilage) (PP (IN in) (IN between) (NP (NP (PRP them)) (, ,) (SBAR (WHNP (WDT which)) (S (VP (VBP help) (S (VP (TO to) (VP (VB make) (S (NP (DT the) (NN movement)) (ADJP (JJ flexible))))))))))))) (. .)))
Joints have cartilage in between them, which help to make the movement flexible.
(ROOT (S (NP (NNS Hagfishes)) (VP (VBP have) (NP (NP (DT a) (NN skull)) (VP (VBN made) (PP (IN of) (NP (NN cartilage)))))) (. .)))