( they ( ( tried ( to ( explain ( that ( some ( laws ( -LRB- incl ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (PRP they)) (VP (VBD tried) (S (VP (TO to) (VP (VB explain) (SBAR (IN that) (FRAG (NP (NP (DT some)) (NP (NNP laws) (-LRB- -LRB-) (NNP incl))))))))) (. .)))
they tried to explain that some laws (incl.
(ROOT (S (NP (NP (NNP Archimedes) (POS ')) (NN law)) (VP (VBZ explains) (NP (SBAR (WHADVP (WRB why)) (S (NP (DT some) (NNS objects)) (VP (VBP float)))) (CC and) (NP (DT some) (NN sink))))))