( ( ( ( This , ) ( of course ) ) , ) ( ( ( is merely ) ( ( a restatement ) ( of ( ( the law ) ( of Archimedes ) ) ) ) ) . ) )
(ROOT (S (NP (NP (DT This)) (, ,) (PP (IN of) (NP (NN course))) (, ,)) (VP (VBZ is) (ADVP (RB merely)) (NP (NP (DT a) (NN restatement)) (PP (IN of) (NP (NP (DT the) (NN law)) (PP (IN of) (NP (NNP Archimedes))))))) (. .)))
This, of course, is merely a restatement of the law of Archimedes.
(ROOT (S (NP (NP (NNP Archimedes) (POS ')) (NN law)) (VP (VBZ explains) (SBAR (WHADVP (WRB why)) (S (NP (NP (DT a) (NN ship)) (VP (VBG weighing) (NP (NP (NNS thousands)) (PP (IN of) (NP (JJ metric) (NNS tons)))))) (VP (VBZ floats) (PP (IN on) (NP (NN water))))))) (. .)))