( ( Natural selection ) ( ( is ( ( the process ) ( ( in which ) ( ( ( living things ) ( with ( beneficial traits ) ) ) ( ( produce ( more offspring ) ) ( than ( others do ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (JJ Natural) (NN selection)) (VP (VBZ is) (NP (NP (DT the) (NN process)) (SBAR (WHPP (IN in) (WHNP (WDT which))) (S (NP (NP (VBG living) (NNS things)) (PP (IN with) (NP (JJ beneficial) (NNS traits)))) (VP (VBP produce) (NP (JJR more) (NN offspring)) (SBAR (IN than) (S (NP (NNS others)) (VP (VBP do))))))))) (. .)))
Natural selection is the process in which  living things with beneficial traits produce more offspring than others do.
(ROOT (S (NP (JJ Natural) (NN selection)) (VP (VBZ is) (NP (NP (DT the) (NN process)) (SBAR (WHNP (WDT that)) (S (VP (VBZ allows) (NP (NNS organisms)) (PP (IN with) (NP (JJR better) (NNS traits) (S (VP (TO to) (VP (VB survive) (CC and) (VB produce))))))))))) (. .)))