( ( ( ( ( ( ( Frogs and ) toads ) ( are ( ( amphibians , ) ( animals ( who ( ( begin ( their lives ) ) ( in ( the water ) ) ) ) ) ) ) ) ( -LRB- ( ( breathing ( with gills ) ) -RRB- ) ) ) and ) ( then ( , ( ( during maturity ) ( , ( live ( on ( land ( -LRB- ( ( breathing ( with lungs ) ) -RRB- ) ) ) ) ) ) ) ) ) ) . )
(ROOT (S (S (NP (NNS Frogs) (CC and) (NNS toads)) (VP (VBP are) (NP (NP (NNS amphibians)) (, ,) (NP (NP (NNS animals)) (SBAR (WHNP (WP who)) (S (VP (VBP begin) (NP (PRP$ their) (NNS lives)) (PP (IN in) (NP (DT the) (NN water)))))))))) (PRN (-LRB- -LRB-) (S (VP (VBG breathing) (PP (IN with) (NP (NNS gills))))) (-RRB- -RRB-)) (CC and) (S (ADVP (RB then)) (, ,) (PP (IN during) (NP (NN maturity))) (, ,) (VP (VBP live) (PP (IN on) (NP (NP (NN land)) (PRN (-LRB- -LRB-) (VP (VBG breathing) (PP (IN with) (NP (NNS lungs)))) (-RRB- -RRB-)))))) (. .)))
Frogs and toads are amphibians, animals who begin their lives in the water (breathing with gills) and then, during maturity, live on land (breathing with lungs).
(ROOT (S (NP (NNS Frogs)) (VP (VBP are) (VP (VBG amphibians) (NP (NP (DT that) (JJ live) (NN part)) (PP (IN of) (NP (NP (NP (DT the) (NN time)) (PP (IN in) (NP (JJ fresh) (NN water)))) (CC and) (NP (NP (JJ live) (NN rest)) (PP (IN of) (NP (NP (DT the) (NN time)) (PP (IN on) (NP (NN land))))))))))) (. .)))