( ( ( ( ( ( All ( living things ) ) ( are ( composed ( of cells ) ) ) ) , ) and ) ( ( new cells ) ( ( arise only ) ( from ( preexisting ones ) ) ) ) ) . )
(ROOT (S (S (NP (DT All) (VBG living) (NNS things)) (VP (VBP are) (VP (VBN composed) (PP (IN of) (NP (NNS cells)))))) (, ,) (CC and) (S (NP (JJ new) (NNS cells)) (VP (VBP arise) (ADVP (RB only)) (PP (IN from) (NP (VBG preexisting) (NNS ones))))) (. .)))
All living things are composed of cells, and new cells arise only from preexisting ones.
(ROOT (S (NP (NNS Cells)) (VP (VBP come) (PP (IN from) (NP (VBG preexisting) (NNS cells)))) (. .)))