( ( then labor ) ( itself ( ( is ( divided ( into ( three stages ) ) ) ) . ) ) )
(ROOT (S (PP (RB then) (NP (NN labor))) (NP (PRP itself)) (VP (VBZ is) (VP (VBN divided) (PP (IN into) (NP (CD three) (NNS stages))))) (. .)))
then labor itself is divided into three stages.
(ROOT (S (NP (NNP Adulthood)) (VP (VBZ is) (VP (VBN divided) (PP (IN into) (NP (CD three) (NNS stages))))) (. .)))