in them , who have carved their own comfortable niche in the world 
(ROOT (PP (IN in) (NP (NP (PRP them)) (, ,) (SBAR (WHNP (WP who)) (S (VP (VBP have) (VP (VBN carved) (NP (PRP$ their) (JJ own) (JJ comfortable) (NN niche)) (PP (IN in) (NP (DT the) (NN world))))))))))
(ROOT (PP (IN ) (NP (NP (PRP )) (, ) (SBAR (WHNP (WP )) (S (VP (VBP ) (VP (VBN ) (NP (PRP$ ) (JJ ) (JJ ) (NN )) (PP (IN ) (NP (DT ) (NN ))))))))))