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It may be lacking phosphorus. I would give the plant some phosphorus, like bone meal. If the foliage looks healthy but there are no blooms, phosphorus is normally the problem. This article should also help: https://www.gardeningknowhow.com/garden-how-to/soil-fertilizers/phosphorus-plant-growth.htm

You can transplant now, but if you do, it most likely will not bloom this year. Moving is hard on a plant and it will sacrifice its blooms in order to focus on recovering from being moved. You might be better transplanting in fall. The plant should recover enough by the next year to bloom for you.

I would use bird netting instead of chicken wire. It is nearly invisible once the plants are on it and can simply be stapled on. You can find it at the hardware store as well.

If the damage is on new growth at or near the soil line, it could be cutworms, which normally feed at night (their daylight counterparts are called loopers). During the day they hide in the soil or leaf litter below. Treat the plants with neem oil and this should help. Here is more information: https://www.gardeningknowhow.com/plant-problems/pests/pesticides/neem-oil-uses.htm

It likely has too much nitrogen. It makes the plant grow lush but with few flowers. Try adding bone meal. This will add phosphorous and balance out the nitrogen. Also, if there is lawn nearby that you fertilize, try not to do it near the clematis.

Here are some other possibilities:
https://www.gardeningknowhow.com/plant-problems/environmental/plant-not-blooming.htm

Unfortunately, you cannot splice them back together, but you may try rooting the cut sections. This article will help:
http://www.ces.ncsu.edu/depts/hort/hil/hil-8702.html