So they set about clearing the land for agriculture, setting fire to massive tracts of forest.
( So ( they ( ( ( ( set ( about ( clearing ( ( the land ) ( for agriculture ) ) ) ) ) , ) ( ( setting fire ) ( to ( ( massive tracts ) ( of forest ) ) ) ) ) . ) ) )
(ROOT (S (IN So) (NP (PRP they)) (VP (VBD set) (PP (IN about) (S (VP (VBG clearing) (NP (NP (DT the) (NN land)) (PP (IN for) (NP (NN agriculture))))))) (, ,) (S (VP (VBG setting) (NP (NN fire)) (PP (TO to) (NP (NP (JJ massive) (NNS tracts)) (PP (IN of) (NP (NN forest)))))))) (. .)))
They were not allowed to deforest for agricultural purposes.
( They ( ( ( were not ) ( allowed ( to ( deforest ( for ( agricultural purposes ) ) ) ) ) ) . ) )
(ROOT (S (NP (PRP They)) (VP (VBD were) (RB not) (VP (VBN allowed) (S (VP (TO to) (VP (VB deforest) (PP (IN for) (NP (JJ agricultural) (NNS purposes)))))))) (. .)))