Answer: Hawthorn shrubs prefer full sunshine, so the bare branches are probably a result of inadequate sunshine, plus infrequent pruning. You can remove any twiggy growth that's non-productive, and then cut the remaining branches and stems back one-third to one-half to encourage new growth. Prune in the early spring to give the shrubs all summer to recover. They will grow in the partial shade, but won't be quite a lush and productive as they would be in full sunshine. If you prune it each spring you'll eventually have a well formed and full shrub.
Best wishes with your landscape!
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