( And ( that ( usually ( ( takes ( two forms ) ) . ) ) ) )
(ROOT (S (CC And) (NP (DT that)) (ADVP (RB usually)) (VP (VBZ takes) (NP (CD two) (NNS forms))) (. .)))
And that usually takes two forms.
(ROOT (S (S (NP (DT This) (NN process)) (ADVP (RB usually)) (VP (VBZ takes) (NP (NP (DT the) (JJS longest) (NN amount)) (PP (IN of) (NP (NN time)))))) (: :) (S (NP (DT an) (NN ocean) (NN basin)) (VP (VBZ forms) (PP (IN between) (NP (CD two) (NNS continents))))) (. .)))
This process usually takes the longest amount of time: an ocean basin forms between two continents.