( ( ( The ( controlled production ) ) ( of food ) ) ( ( allowed ( a ( growing population ) ) ) . ) )
(ROOT (S (NP (NP (DT The) (JJ controlled) (NN production)) (PP (IN of) (NP (NN food)))) (VP (VBD allowed) (NP (DT a) (VBG growing) (NN population))) (. .)))
The controlled production of food allowed a growing population.
(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)) (. .)))