( ( the population ) ( ( grows ( unimpeded ( by ( resource ( ( limitation or ) competition ) ) ) ) ) . ) )
(ROOT (S (NP (DT the) (NN population)) (VP (VBZ grows) (VP (VBN unimpeded) (PP (IN by) (NP (NN resource) (NN limitation) (CC or) (NN competition))))) (. .)))
the population grows unimpeded by resource limitation or competition.
(ROOT (S (SBAR (IN As) (S (NP (DT the) (NN population)) (VP (VBZ grows)))) (, ,) (NP (NP (NN competition)) (PP (IN for) (NP (NN food)))) (VP (VBZ grows)) (. .)))