( ( This theory ) ( ( divides ( careers ( in ( three stages ) ) ) ) . ) )
(ROOT (S (NP (DT This) (NN theory)) (VP (VBZ divides) (NP (NP (NNS careers)) (PP (IN in) (NP (CD three) (NNS stages))))) (. .)))
This theory divides careers in three stages.
(ROOT (S (NP (NNP Adulthood)) (VP (VBZ is) (VP (VBN divided) (PP (IN into) (NP (CD three) (NNS stages))))) (. .)))