( ( The second ) ( , ( endometritis ( ( can ( ( induce abortion ) ( by ( stimulating ( an ( inflammatory response ) ) ) ) ) ) . ) ) ) )
(ROOT (S (NP (DT The) (NN second)) (, ,) (NP (NNS endometritis)) (VP (MD can) (VP (VB induce) (NP (NN abortion)) (PP (IN by) (S (VP (VBG stimulating) (NP (DT an) (JJ inflammatory) (NN response))))))) (. .)))
The second, endometritis can induce abortion by stimulating an inflammatory response.
(ROOT (S (NP (JJ Inflammatory) (NN response)) (VP (VBZ is) (NP (NP (DT the) (JJ second) (NN line)) (PP (IN of) (NP (NN defense))))) (. .)))