Use a fabric pot or an “Air-Pot” to prevent this from ever happening, when the roots reach air, they “prune” themselves and start to laterally branch, they never get root bound.
Looks quite normal. Just next time don’t let your plant grow too long in a small container, it’s cuts off its potential.
Just re pot in a bigger pot and you should be fine, just will take couple days to get used to it’s medium.
You can cut the roots to open the ball and make sure that the roots fill the whole new pot in all direction well, don't worry, they will recovery quiet easily