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You should prune out the dead branches by cutting them at their base (where the dead branch attaches to a larger branch or the main stem). This will benefit the shrub's health and allow it to grow back stronger. The best time to prune is in the late winter or early spring. However, do not remove more than 1/3 of the entire plant at one time.

Here is more about snowberry shrub care:

https://www.gardeningknowhow.com/ornamental/shrubs/snowberry-bush/snowberry-bush-care.htm

Snowberry bushes should be planted in spring or in early to mid fall. Choose a cool, overcast day to plant, and use proper planting techniques:
http://www.clemson.edu/extension/hgic/plants/landscape/shrubs/hgic1052.html

Make sure your Snowberry Shrubs are spaced properly and pruned regularly. Here is an article that may help you:

https://www.gardeningknowhow.com/ornamental/shrubs/snowberry-bush/snowberry-bush-care.htm

Since the Snowberry attracts a just about every pollinator out there (bees, hummingbirds and butterflies), there's a good chance that the flowers on a single bush will develop into fruit. If you want a 100% certainty of your shrubs bearing fruit, go ahead and get two, but space them carefully so that they get plenty of air circulation which will reduce the chance of disease.

Don't forget that all parts of this plant are poisonous if ingested, except to the birds who will eat them during the winter months.

Here is some additional information on Snowberry bushes:

https://www.gardeningknowhow.com/ornamental/shrubs/snowberry-bush/snowberry-bush-care.htm

This article will help you with planting Snowberry.

https://www.gardeningknowhow.com/ornamental/shrubs/snowberry-bush/snowberry-bush-care.htm

Symphoricarpus has a fibrous, shallow root system. This makes it possible to divide the shrub after digging it up.