farmworkers conducted by the U.S.
( farmworkers ( conducted ( by ( the U.S. ) ) ) )
(ROOT (S (NP (NNS farmworkers)) (VP (VBN conducted) (PP (IN by) (NP (DT the) (NNP U.S.))))))
Trying to find out how to fuel the rocket, the US employed the brightest farmworkers in the field.
( ( Trying ( to ( ( find out ) ( how ( to ( fuel ( the rocket ) ) ) ) ) ) ) ( , ( ( the US ) ( ( employed ( ( the ( brightest farmworkers ) ) ( in ( the field ) ) ) ) . ) ) ) )
(ROOT (S (S (VP (VBG Trying) (S (VP (TO to) (VP (VB find) (PRT (RP out)) (SBAR (WHADVP (WRB how)) (S (VP (TO to) (VP (VB fuel) (NP (DT the) (NN rocket))))))))))) (, ,) (NP (DT the) (NNP US)) (VP (VBN employed) (NP (NP (DT the) (JJS brightest) (NNS farmworkers)) (PP (IN in) (NP (DT the) (NN field))))) (. .)))