The flame or whatever it was had enough heat, but it was hard to control.
( ( ( ( ( ( ( ( The flame ) or ) whatever ) ( it ( was ( had ( enough heat ) ) ) ) ) , ) but ) ( it ( was ( hard ( to control ) ) ) ) ) . )
(ROOT (S (S (NP (NP (DT The) (NN flame)) (CC or) (NP (NNP whatever))) (NP (PRP it)) (VP (VBD was) (VP (VBN had) (NP (JJ enough) (NN heat))))) (, ,) (CC but) (S (NP (PRP it)) (VP (VBD was) (ADJP (JJ hard) (S (VP (TO to) (VP (VB control))))))) (. .)))
The hot flame was hard to control because it was big. 
( ( The ( hot flame ) ) ( ( was ( hard ( to ( control ( because ( it ( was big ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (DT The) (JJ hot) (NN flame)) (VP (VBD was) (ADJP (JJ hard) (S (VP (TO to) (VP (VB control) (SBAR (IN because) (S (NP (PRP it)) (VP (VBD was) (ADJP (JJ big)))))))))) (. .)))