The anthropologist Napoleon Chagnon has shown that Yanomamo men who have killed other men have more wives and more offspring than average guys.
( ( The ( anthropologist ( Napoleon Chagnon ) ) ) ( ( has ( shown ( that ( ( ( Yanomamo men ) ( who ( have ( killed ( other men ) ) ) ) ) ( have ( ( ( more wives ) and ) ( ( more offspring ) ( than ( average guys ) ) ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (DT The) (JJ anthropologist) (NNP Napoleon) (NNP Chagnon)) (VP (VBZ has) (VP (VBN shown) (SBAR (IN that) (S (NP (NP (NNP Yanomamo) (NNS men)) (SBAR (WHNP (WP who)) (S (VP (VBP have) (VP (VBN killed) (NP (JJ other) (NNS men))))))) (VP (VBP have) (NP (NP (JJR more) (NNS wives)) (CC and) (NP (NP (JJR more) (NN offspring)) (PP (IN than) (NP (JJ average) (NNS guys)))))))))) (. .)))
Yanomamo men have never killed anyone.
( ( Yanomamo men ) ( ( ( have never ) ( killed anyone ) ) . ) )
(ROOT (S (NP (NNP Yanomamo) (NNS men)) (VP (VBP have) (ADVP (RB never)) (VP (VBN killed) (NP (NN anyone)))) (. .)))