Hi there. There is quite a bit of rot due to the fact that your soil is too water retentive. You will want to make a clean cut on the stem using a sterilized pair of trimmers, let the stem callous for about a week, and plant it into either a gritty mix of your choice or cactus and succulent soil with AT LEAST 60% perlite mixed in. It is also etiolated, stretching for light. So, you definitely want to make sure it gets at least 4 hours of bright sun a day. They can handle more though. I hope you are able to save it. :)

IME when aerial roots come out, particularly with kalanchoe, the plant is either in need of water or something is amiss in the roots area. I should say maybe not so much "in need of" but could use more if possible. They live on just fine without it though. i have four kalanchoe tomasa, separated from one pot into four. The one that gets watered regularly in my kitchen, no aeirial roots. The two by the southern window with little water, tons. The one in east window, very few, watered semi regularly. when my echevaria like the one in the pic is dry, the aerial roots stream out. I am not saying one has to water then. But I do think the roots are a result of drier soil.

totally, it's almost a guarantee. I just put them in a pot and plop them in my stump yard. my wife is a landscape designer and she gives me garden center rejects all the time, I have a large collection of abused plants I'm trying to show some love

Sharon When buying C&S soil get a bag of perlite (or pumice if available). This should be sifted or rinsed (see my comments IN THIS THREAD where I posted example photo of sieves, and described process). If my plant in that pot, I would check moisture of existing mix using a long wooden-bamboo skewer or chopstick or thinner dowel or stick. Stick it deep inside of pot - I would aim to go 3/4 deep, could be all the way. Use stick no thicker than pencil. Long bamboo skewers could be found in dollar store too - just make sure it is long enough to reach deep. If stick comes out dry and clean soil is dry. Depending on when you watered last - deep pot like that holds lots of soil and take longer to dry up. It is little trickier to water correctly. It could be difficult to tell at the begging, you need to learn. If you determine that it drains well, add some new mixl and try to mix it with existing as much as possible, using thinner stick. Maybe you can attempt re-potting next year? I am saying that since plant looks ok (besides needing some more sunlight), so perhaps existing soil drains quite well. Is there any chance of asking previous owner what soil he/she used and when last re-potted? Also, roots of your succulents are not that deep that they would need such deep pot. So it is important for them not to sit in 'muck' - but there are few 'levels' with plants, so I would keep checking soil for moisture couple/few inches below. It may look scary to repot such big plant in such big pot, but you will learn...:) Worse that could happen is that more branches would get snapped - but they can be re-rooted. Sooner or later it will need to be re-potted, and you can start learning by rooting the broken branch. I guess you got it because you like how it grows and trails in that strawberry jar? - It looks pretty good, so I understand. But huge pots like that are trickier to handle when re-potting. It is also recurved on top, making re-potting bit more difficult. I have plant that grows in similar way. It is in much shorter bowl-type pot, wide at the top. I may do some beheading this year, since some stalks are getting too long (last years photo - it is even fuller now): Stick ends A and C into mix. NOT B - if you did, that part of plant would be upside-down, and may have difficulty to grow (some plants do not grow at all). It should still grow; and make sure you do not water it immediately: no roots - no water (you can find more comments about that in BEHEADING threads) Sorry for such long post - that is also why I refer to other threads. Ask should you have further questions.