( ( For example ) ( , ( ( consider ( ( a piece ) ( of ( ( firewood ( -LRB- ( ( ( a form ) ( of ( condensed ( solar energy ) ) ) ) -RRB- ) ) ) ( for ( a ( wood-burning stove ) ) ) ) ) ) ) . ) ) )
(ROOT (S (PP (IN For) (NP (NN example))) (, ,) (VP (VB consider) (NP (NP (DT a) (NN piece)) (PP (IN of) (NP (NP (NP (NN firewood)) (PRN (-LRB- -LRB-) (NP (NP (DT a) (NN form)) (PP (IN of) (NP (JJ condensed) (JJ solar) (NN energy)))) (-RRB- -RRB-))) (PP (IN for) (NP (DT a) (JJ wood-burning) (NN stove))))))) (. .)))
For example, consider a piece of firewood (a form of condensed solar energy) for a wood-burning stove.
(ROOT (S (NP (NP (DT The) (NN action)) (PP (IN of) (S (VP (VBG burning) (NP (NP (DT a) (NN piece)) (PP (IN of) (NP (NN wood)))))))) (VP (VBZ forms) (NP (DT a) (JJ different) (NN chemical) (NN substance))) (. .)))