Goodwin & Gulick 1039 say ‘A relative [pronoun] is seldom repeated in a new case in the same sentence. Either it is omitted and understood in the latter part of the sentence, or a personal or demonstrative pronoun takes its place.’ – but they give only a few examples.
Not the tomb in which they lie but rather that in which their glory is left behind
I think I remember Sidgwick also talking about this in the notes at the front of Greek Prose Composition, contrasting greek in this respect against latin…