( Hence ( , ( while ( ( our ( hard framework ) ) ( is ( said ( to ( be ( ( ( ( ( an endoskeleton ) , ) or ) ( internal skeleton ) ) ; ) ) ) ) ) ) ) ) )
(ROOT (PRN (ADVP (RB Hence)) (, ,) (SBAR (IN while) (S (NP (PRP$ our) (JJ hard) (NN framework)) (VP (VBZ is) (VP (VBN said) (S (VP (TO to) (VP (VB be) (NP (NP (DT an) (NN endoskeleton)) (, ,) (CC or) (NP (JJ internal) (NN skeleton)) (: ;)))))))))))
Hence, while our hard framework is said to be an endoskeleton, or internal skeleton;
(ROOT (S (NP (NNS Humans)) (VP (VBP possess) (NP (DT a) (PRN (-LRB- -LRB-) (NP (NN n)) (-RRB- -RRB-)) (NN endoskeleton))) (. .)))