( for ( it ( ( ( is ( a ( well-ascertained fact ) ) ) ( that ( ( ( ( ( ( ( with man ) ( ( the number ) ( of ( males ( dying ( ( ( before or ) during ) birth ) ) ) ) ) ) , ) and ) ( ( during ( the ( first ( two years ) ) ) ) ( of infancy ) ) ) , ) ( is ( ( considerably larger ) ( than ( that ( of females ) ) ) ) ) ) ) ) . ) ) )
(ROOT (S (IN for) (NP (PRP it)) (VP (VBZ is) (NP (DT a) (JJ well-ascertained) (NN fact)) (SBAR (IN that) (S (NP (NP (PP (IN with) (NP (NN man))) (NP (DT the) (NN number)) (PP (IN of) (NP (NP (NNS males)) (VP (VBG dying) (PP (IN before) (CC or) (IN during) (NP (NN birth))))))) (, ,) (CC and) (NP (PP (IN during) (NP (DT the) (JJ first) (CD two) (NNS years))) (PP (IN of) (NP (NN infancy)))) (, ,)) (VP (VBZ is) (ADJP (ADJP (RB considerably) (JJR larger)) (PP (IN than) (NP (NP (DT that)) (PP (IN of) (NP (NNS females)))))))))) (. .)))
for it is a well-ascertained fact that with man the number of males dying before or during birth, and during the first two years of infancy, is considerably larger than that of females.
(ROOT (S (NP (NNP Infancy)) (VP (VBZ is) (NP (NP (DT the) (JJ first) (NN year)) (PP (IN of) (NP (NP (NN life)) (PP (VBG following) (NP (NN birth))))))) (. .)))