( Coral ( ( is ( made ( of ( ( the exoskeletons ) ( of ( ( many thousands ) ( of ( ( tiny ( marine animals ) ) ( called polyps ) ) ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (NNP Coral)) (VP (VBZ is) (VP (VBN made) (PP (IN of) (NP (NP (DT the) (NNS exoskeletons)) (PP (IN of) (NP (NP (JJ many) (NNS thousands)) (PP (IN of) (NP (NP (JJ tiny) (JJ marine) (NNS animals)) (VP (VBN called) (NP (NNS polyps))))))))))) (. .)))
Coral is made of the exoskeletons of many thousands of tiny marine animals called polyps.
(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)))))))))) (. .)))