( However ( , ( ( ( the majority ) ( of species ) ) ( ( live ( in ( the ocean ) ) ) . ) ) ) )
(ROOT (S (ADVP (RB However)) (, ,) (NP (NP (DT the) (NN majority)) (PP (IN of) (NP (NNS species)))) (VP (VBP live) (PP (IN in) (NP (DT the) (NN ocean)))) (. .)))
However, the majority of species live  in the ocean.
(ROOT (S (NP (NP (DT The) (NN majority)) (PP (IN of) (NP (NNS species)))) (VP (VBP live) (PP (IN in) (NP (DT the) (NN ocean)))) (. .)))