( ( The cranium ) ( ( is ( ( the part ) ( of ( ( the skull ) ( that ( ( ( surrounds and ) protects ) ( the brain ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (DT The) (NN cranium)) (VP (VBZ is) (NP (NP (DT the) (NN part)) (PP (IN of) (NP (NP (DT the) (NN skull)) (SBAR (WHNP (WDT that)) (S (VP (VBZ surrounds) (CC and) (VBZ protects) (NP (DT the) (NN brain))))))))) (. .)))
The cranium is the part of the skull that surrounds and protects the brain.
(ROOT (S (NP (NP (DT The) (NN cranium)) (PRN (-LRB- -LRB-) (NP (NN skull)) (-RRB- -RRB-))) (VP (VBP protect) (S (-LRB- -LRB-) (NP (PRP s)) (-RRB- -RRB-) (NP (DT the) (NN brain)))) (. .)))
The cranium (skull) protect(s) the brain.