( ( At ( this time ) ) ( , ( Galileo ( also ( ( ( engaged ( in ( ( a dispute ) ( over ( the reasons ) ) ) ) ) ( that ( objects ( ( ( ( ( float or ) sink ) ( in water ) ) , ) ( siding ( with ( Archimedes ( against Aristotle ) ) ) ) ) ) ) ) . ) ) ) ) )
(ROOT (S (PP (IN At) (NP (DT this) (NN time))) (, ,) (NP (NNP Galileo)) (ADVP (RB also)) (VP (VBD engaged) (PP (IN in) (NP (NP (DT a) (NN dispute)) (PP (IN over) (NP (DT the) (NNS reasons))))) (SBAR (IN that) (S (NP (NNS objects)) (VP (VB float) (CC or) (VB sink) (PP (IN in) (NP (NN water))) (, ,) (NP (NP (NN siding)) (PP (IN with) (NP (NP (NNP Archimedes)) (PP (IN against) (NP (NNP Aristotle)))))))))) (. .)))
At this time, Galileo also engaged in a dispute over the reasons that objects float or sink in water, siding with Archimedes against Aristotle.
(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))))))