( ( In 1975 ) ( , ( ( Richard Leakey ) ( ( found ( ( ( a ( ( relatively complete ) cranium ) ) and ) ( parts ( of ( ( the rest ) ( of ( a skull ) ) ) ) ) ) ) . ) ) ) )
(ROOT (S (PP (IN In) (NP (CD 1975))) (, ,) (NP (NNP Richard) (NNP Leakey)) (VP (VBD found) (NP (NP (DT a) (ADJP (RB relatively) (JJ complete)) (NN cranium)) (CC and) (NP (NP (NNS parts)) (PP (IN of) (NP (NP (DT the) (NN rest)) (PP (IN of) (NP (DT a) (NN skull)))))))) (. .)))
In 1975, Richard Leakey found a relatively complete cranium and parts of the rest of a skull.
(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.