They capitalized on the natural resources by using the salt to cure fish, which they exported to their home country.
( They ( ( ( capitalized ( on ( the ( natural resources ) ) ) ) ( by ( using ( the ( salt ( to ( cure ( ( fish , ) ( which ( they ( exported ( to ( their ( home country ) ) ) ) ) ) ) ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (PRP They)) (VP (VBD capitalized) (PP (IN on) (NP (DT the) (JJ natural) (NNS resources))) (PP (IN by) (S (VP (VBG using) (NP (DT the) (NN salt) (S (VP (TO to) (VP (VB cure) (NP (NP (NN fish)) (, ,) (SBAR (WHNP (WDT which)) (S (NP (PRP they)) (VP (VBD exported) (PP (TO to) (NP (PRP$ their) (NN home) (NN country))))))))))))))) (. .)))
The use of salt on meats was revolutionary. 
( ( ( The use ) ( of ( salt ( on meats ) ) ) ) ( ( was revolutionary ) . ) )
(ROOT (S (NP (NP (DT The) (NN use)) (PP (IN of) (NP (NP (NN salt)) (PP (IN on) (NP (NNS meats)))))) (VP (VBD was) (ADJP (JJ revolutionary))) (. .)))