In the ancestral environment a man would be likely to have more offspring if he got his pick of the most fertile-seeming women.
( ( In ( the ( ancestral environment ) ) ) ( ( a man ) ( ( would ( be ( likely ( to ( ( have ( more offspring ) ) ( if ( he ( got ( ( his pick ) ( of ( the ( most ( fertile-seeming women ) ) ) ) ) ) ) ) ) ) ) ) ) . ) ) )
(ROOT (S (PP (IN In) (NP (DT the) (JJ ancestral) (NN environment))) (NP (DT a) (NN man)) (VP (MD would) (VP (VB be) (ADJP (JJ likely) (S (VP (TO to) (VP (VB have) (NP (JJR more) (NN offspring)) (SBAR (IN if) (S (NP (PRP he)) (VP (VBD got) (NP (NP (PRP$ his) (NN pick)) (PP (IN of) (NP (DT the) (JJS most) (JJ fertile-seeming) (NNS women))))))))))))) (. .)))
Only a man who stayed with one female spread his genes most efficiently.
( Only ( a ( ( man ( who ( stayed ( with ( ( one female ) ( ( spread ( his genes ) ) ( most efficiently ) ) ) ) ) ) ) . ) ) )
(ROOT (NP (RB Only) (DT a) (NN man) (SBAR (WHNP (WP who)) (S (VP (VBD stayed) (PP (IN with) (NP (NP (CD one) (NN female)) (VP (VBN spread) (NP (PRP$ his) (NNS genes)) (ADVP (RBS most) (RB efficiently)))))))) (. .)))