( develop ( ( a graph ) ( showing ( ( the history ) ( of ( the ( percent -LRB- ) ) ) ) ) ) )
(ROOT (S (VP (VB develop) (NP (NP (DT a) (NN graph)) (VP (VBG showing) (NP (NP (DT the) (NN history)) (PP (IN of) (NP (DT the) (NN percent) (NN -LRB-)))))))))
develop a graph showing the history of the percent (
(ROOT (S (NP (NNP Circle) (NNS graphs)) (VP (VBP are) (ADJP (JJ useful) (PP (IN for) (S (VP (VBG showing) (NP (NP (NNS percents)) (PP (IN of) (NP (DT a) (NN whole))))))))) (. .)))