( ( For example ) ( , ( ( ( an insulator ) ( on ( a ( power line ) ) ) ) ( ( could ( be ( ( ( replaced ( through ( ( the use ) ( of ( live-line tools ) ) ) ) ) , ) ( ( ( ( through ( ( ( the use ) ( of rubber ) ) ( insulating equipment ) ) ) , ) or ) ( by ( deenergizing ( the line ) ) ) ) ) ) ) . ) ) ) )
(ROOT (S (PP (IN For) (NP (NN example))) (, ,) (NP (NP (DT an) (NN insulator)) (PP (IN on) (NP (DT a) (NN power) (NN line)))) (VP (MD could) (VP (VB be) (VP (VBN replaced) (PP (IN through) (NP (NP (DT the) (NN use)) (PP (IN of) (NP (JJ live-line) (NNS tools))))) (, ,) (PP (PP (IN through) (S (NP (NP (DT the) (NN use)) (PP (IN of) (NP (NN rubber)))) (VP (VBG insulating) (NP (NN equipment))))) (, ,) (CC or) (PP (IN by) (S (VP (VBG deenergizing) (NP (DT the) (NN line))))))))) (. .)))
For example, an insulator on a power line could be replaced through the use of live-line tools, through the use of rubber insulating equipment, or by deenergizing the line.
(ROOT (S (NP (NNP Rubber)) (VP (VBZ is) (NP (NP (DT an) (NN example)) (PP (IN of) (NP (NP (DT a) (-LRB- -LRB-) (NP (NN n)) (-RRB- -RRB-) (NNS insulators)) (SBAR (WHNP (WDT that)) (S (VP (VBZ does) (RB not) (VP (VB allow) (S (NP (NNS electrons)) (VP (TO to) (VP (VB move) (PP (IN through) (NP (PRP them)))))))))))))) (. .)))