( Frogs ( ( are ( ( amphibians , ) ( which ( means ( that ( they ( typically ( ( ( live ( on land ) ) but ) ( breed underwater ) ) ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (NNS Frogs)) (VP (VBP are) (NP (NP (NNS amphibians)) (, ,) (SBAR (WHNP (WDT which)) (S (VP (VBZ means) (SBAR (IN that) (S (NP (PRP they)) (ADVP (RB typically)) (VP (VP (VBP live) (PP (IN on) (NP (NN land)))) (CC but) (VP (VBP breed) (NP (JJ underwater))))))))))) (. .)))
Frogs are amphibians, which means that they typically live on land but breed underwater.
(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))))))))))) (. .)))