( They ( ( ( are ( ( a type ) ( of echinoderm ) ) ) ( so ( they ( have ( an endoskeleton ) ) ) ) ) . ) )
(ROOT (S (NP (PRP They)) (VP (VBP are) (NP (NP (DT a) (NN type)) (PP (IN of) (NP (NN echinoderm)))) (SBAR (IN so) (S (NP (PRP they)) (VP (VBP have) (NP (DT an) (NN endoskeleton)))))) (. .)))
They are a type of echinoderm so they have an endoskeleton.
(ROOT (S (NP (NNS Humans)) (VP (VBP possess) (NP (DT a) (PRN (-LRB- -LRB-) (NP (NN n)) (-RRB- -RRB-)) (NN endoskeleton))) (. .)))