( ( ( A ( hard exoskeleton ) ) ( made ( of ( a ( strong polysaccharide ) ) ) ) ) ( ( called chitin ) . ) )
(ROOT (S (NP (NP (DT A) (JJ hard) (NN exoskeleton)) (VP (VBN made) (PP (IN of) (NP (DT a) (JJ strong) (NN polysaccharide))))) (VP (VBD called) (NP (NN chitin))) (. .)))
A hard exoskeleton made of a strong polysaccharide called chitin .
(ROOT (S (NP (PRP You)) (VP (VBP call) (NP (NP (DT the) (JJ hard) (NN case)) (SBAR (WHNP (WDT that)) (S (VP (VBZ surrounds) (NP (NP (DT the) (JJ soft) (NNS parts)) (PP (IN of) (NP (NP (DT some) (NNS animals)) (NP (DT the) (NN exoskeleton)))))))))) (. .)))