Nobody knows much about the early Etruscans.
( Nobody ( ( knows ( much ( about ( the ( early Etruscans ) ) ) ) ) . ) )
(ROOT (S (NP (NN Nobody)) (VP (VBZ knows) (ADVP (RB much) (NP (RB about) (DT the) (JJ early) (NNS Etruscans)))) (. .)))
Nobody knows about them, because they didn't exist for a long time.
( Nobody ( ( ( ( knows ( about them ) ) , ) ( because ( they ( ( did n't ) ( exist ( for ( a ( long time ) ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (NN Nobody)) (VP (VBZ knows) (PP (IN about) (NP (PRP them))) (, ,) (SBAR (IN because) (S (NP (PRP they)) (VP (VBD did) (RB n't) (VP (VB exist) (PP (IN for) (NP (DT a) (JJ long) (NN time)))))))) (. .)))