theory of demographic transition造句

In the realm of theoretical demography, some of his work has helped to expand the literature on the theory of demographic transition in connection with the dynamics of fertility changes during the early stages of societal modernization as well as in connection with the emergence of a post-transitional demographic regime, what he calls the regime of demographic maturity.
It's difficult to find theory of demographic transition in a sentence. 用theory of demographic transition造句挺难的