( ( For ferns ) ( , ( ( ( the ( dominant phase ) ) ( we ( often see ) ) ) ( ( ( are usually ) ( the sporophytes ) ) . ) ) ) )
(ROOT (S (PP (IN For) (NP (NNS ferns))) (, ,) (NP (NP (DT the) (JJ dominant) (NN phase)) (SBAR (S (NP (PRP we)) (ADVP (RB often)) (VP (VBP see))))) (VP (VBP are) (ADVP (RB usually)) (NP (DT the) (NNS sporophytes))) (. .)))
For ferns, the dominant phase we often see are usually the sporophytes.
(ROOT (S (NP (DT The) (JJ sporophyte) (NN stage)) (VP (VBZ is) (NP (NP (DT the) (JJ dominant) (NN stage)) (PP (IN of) (NP (NP (DT the) (NN lifecycle)) (PP (IN of) (NP (DT a) (NN fern))))))) (. .)))