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Trim back tall, overly vigorous shoots, cutting these long stems back to or just below the height of lower stems, making clean cuts just above a leaf node or junction with another stem. You can prune a desert rose year-round, though pruning the plant in late fall may promote a flush of new growth that is especially susceptible to cold weather damage. Blooming occurs on new growth, so timing pruning well before flowering encourages more branching and, as a result, more blooms to develop.
Prune back any crossing or damaged branches and otherwise shape the desert rose as desired.

These articles may help you with a repair.

https://www.gardeningknowhow.com/garden-how-to/propagation/grafting/reattaching-broken-stems.htm

https://www.gardeningknowhow.com/ornamental/flowers/desert-rose/caring-for-desert-rose-plants.htm

One of the most common problems is stem root and leaf disease. Stem rot occurs on the tips of the adenium desert rose plants and progresses down the stem. Leaf rot occurs in adeniums when the leaf is continually wet.
Fist, leaf rot in adeniums is the easiest to treat. Just remove the effective leafs on he desert rose plant and move the location of the adenium so the leaves dry out. When you water try not to wet the leaves or if your plants are watered using sprinklers make sure you do it early in the day so the leaves have time to dry out quickly. Do not water adeniums in the evenings.

Desert rose plant stem root is caused by a fungus. It’s the most common problem with adeniums. The adenium rot is either black, dark drown or yellow. The actual desert rose rot part can be wet or dry and it processes down the stem of the adenium. When we see this we do not wait for he plant to fight the problem we cut the effective part off the plant. When cutting off the stem make sure you look inside the stem and make sure the adenium plant cut is far enough down so you only see good tissue with discoloration. Adeniums may stop this rot by forming a abscission zone.
https://www.gardeningknowhow.com/ornamental/flowers/desert-rose/caring-for-desert-rose-plants.htm

This is a phenomenon that happens occasionally when growing from seed, variegated leaves also can germinate.
From my research, the all white seedlings are quite difficult to grow to adult size.
https://www.gardeningknowhow.com/ornamental/flowers/desert-rose/desert-rose-propagation.htm

Yes, you can plant the whole seed, as it is. You will want to plant them as fresh as possible, as they lose viability rather quickly. This article will help: https://www.gardeningknowhow.com/ornamental/flowers/desert-rose/desert-rose-propagation.htm

Use a potting mix formulated for cacti or succulents or use regular potting soil mixed with equal parts perlite or sand to ensure the soil is well-draining.

Read more at Gardening Know How: Desert Rose Repotting – Learn When To Repot Desert Rose Plants https://www.gardeningknowhow.com/ornamental/flowers/desert-rose/repotting-desert-rose-plants.htm

https://www.amazon.com/Dr-Earth-810-Exotic-Succulent/dp/B01LN0T54M