In the absence of effective prevention or treatment, the increase in the numbers of people with these diseases will come about as a simple consequence of an increase in the size of the population most at risk, namely, those aged 60 years and older.
(the increase in the numbers of people with these diseases; will come about; L:In the absence of effective prevention or treatment)
the increase in the numbers of people with these diseases
will come about
L:In the absence of effective prevention or treatment