Jade needs to be ruthlessly pruned to develop a thick trunk and bushy demeanour. All those prunings/cuttings can be put in jars of water and they will root fast. I would cut the main plant back to about 4 ins above the level of the substrate. Whittle down into 4 ins pieces - even leafless stems will root and produce new buds.

Early spring is a good time to do it, but anytime in the summer is fine for this resilient plant.

Lie any loose green leaves onto a seed tray of moist well draining gritty cactus-type substrate and they too should root and shoot for new plants too.

Repeat pruning all the time - for every cutting you take, the main plant will normally grow 2 new buds that turn into new shoots.