Answer: It's not unusual for old, large-sized yew bushes to have only live growth on the outer edge and dead growth in the center. When you have an incident like a snow storm bending the center open, there are a few options you can take. The easiest and most satisfying would be to start all over again with another yew or another bush. Yews can be pruned severely into the woody growth and they will resprout. However, my experience is this takes time (years) and the new growth isn't very vigorous. If you decide to prune, do it now.
You may also tie the shrub back together with wire, but depending on the damage, this may only be a temporary solution. I'd say treat yourself to a new shrub.
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