( ( ( ( ( The ( cell wall ) ) weakens ) and ) ( ( the bacterium ) bursts ) ) . )
(ROOT (S (S (NP (DT The) (NN cell) (NN wall)) (VP (VBZ weakens))) (CC and) (S (NP (DT the) (NN bacterium)) (VP (VBZ bursts))) (. .)))
The cell wall weakens and the bacterium bursts.
(ROOT (S (NP (DT A) (NN lysozyme)) (VP (VBZ destroys) (NP (NNS bacteria)) (PP (IN by) (S (VP (VBG digesting) (NP (PRP$ their) (NN cell) (NNS walls)))))) (. .)))