This history is important in the context of global warming because the limiting factor in these epidemics was the onset of cold weather.
(This history; is; important in the context of global warming; because the limiting factor in these epidemics was the onset of cold weather) (the limiting factor in these epidemics; was; the onset of cold weather)
This history the limiting factor in these epidemics
is was
important in the context of global warming because the limiting factor in these epidemics was the onset of cold weather
the onset of cold weather