( ( For example ) ( , ( ( when ( trees ( are ( cut down ) ) ) ) ( , ( ( birds ( who ( nested ( in ( the trees ) ) ) ) ) ( ( ( can ( no longer ) ) ( live there ) ) . ) ) ) ) ) )
(ROOT (S (PP (IN For) (NP (NN example))) (, ,) (SBAR (WHADVP (WRB when)) (S (NP (NNS trees)) (VP (VBP are) (VP (VBN cut) (PRT (RP down)))))) (, ,) (NP (NP (NNS birds)) (SBAR (WHNP (WP who)) (S (VP (VBN nested) (PP (IN in) (NP (DT the) (NNS trees))))))) (VP (MD can) (ADVP (RB no) (RB longer)) (VP (VB live) (ADVP (RB there)))) (. .)))
For example, when trees are cut down, birds who nested in the trees can no longer live there.
(ROOT (S (NP (NNS People)) (VP (MD can) (VP (VB help) (VP (VB keep) (NP (DT a) (NN forest)) (NP (NP (DT a) (JJ good) (NN place)) (PP (IN for) (NP (NNS birds) (S (VP (TO to) (VP (VB live) (PP (IN by) (S (VP (VBG preventing) (NP (ADJP (RB too) (JJ many)) (NNS trees)) (PP (IN from) (S (VP (VBG being) (VP (VBN cut) (PRT (RP down)))))))))))))))))) (. .)))