( ( ( The force ) ( that ( acts ( on ( ( a proton ) ( due ( to two ) ) ) ) ) ) ) ( ( charged objects ) . ) )
(ROOT (S (NP (NP (DT The) (NN force)) (SBAR (WHNP (WDT that)) (S (VP (VBZ acts) (PP (IN on) (NP (NP (DT a) (NN proton)) (ADJP (JJ due) (PP (TO to) (NP (CD two)))))))))) (VP (VBD charged) (NP (NNS objects))) (. .)))
The force that acts on a proton due to two charged objects.
(ROOT (S (NP (NP (NNS Objects)) (PP (IN on) (NP (NN earth)))) (VP (VBP have) (NP (NP (CD two) (NNS forces)) (VP (VBG acting) (PP (IN on) (NP (PRP them))) (PP (IN at) (NP (DT all) (NNS times)))))) (. .)))