( ( In 1858 ) ( , ( ( Rudolf Virchow ) ( finally ( ( ( came ( to ( the conclusion ) ) ) ( that ( cells ( can ( ( arise only ) ( from ( preexisting cells ) ) ) ) ) ) ) . ) ) ) ) )
(ROOT (S (PP (IN In) (NP (CD 1858))) (, ,) (NP (NNP Rudolf) (NNP Virchow)) (ADVP (RB finally)) (VP (VBD came) (PP (TO to) (NP (DT the) (NN conclusion))) (SBAR (IN that) (S (NP (NNS cells)) (VP (MD can) (VP (VB arise) (ADVP (RB only)) (PP (IN from) (NP (VBG preexisting) (NNS cells)))))))) (. .)))
In 1858, Rudolf Virchow finally came to the conclusion that cells can arise only from preexisting cells.
(ROOT (S (NP (NNS Cells)) (VP (VBP come) (PP (IN from) (NP (VBG preexisting) (NNS cells)))) (. .)))