Using solution of DDE model as history for another (larger) DDE problem

[ChrisRackauckas]

@jewh

However it is not clear to me how to use the output of solve(prob, alg) to define the history function h(p, t) to achieve this, as solve returns a vector with (often) variable timesteps between values.

The output of solve is a sol(t) function so h(p,t) = sol(t) just works.