First of all, you need to cover the floor with a dust cover. Also cover any exposed furnishing in the room.
Take a putty knife, and scrap away the damaged part of the ceiling. You cannot place a new layer of texture on the smashed one because it will be of no waster. Sooner or later, the ceiling will crack again.
Sand the edges around the damaged area. For this, you can use sander with sandpaper.
Once the damaged portion is completely cleared, apply a small amount of drywall compound on the area with the help of the putty knife. Let the compound dry.
The sander again comes into play. Use it to get a smooth surface. If the area is damaged due to water stain, don’t forget to apply stain sealer. This will surely prevent the problem in the coming days.
Now, it is the time to re-texture by using a spray texture repair kit. It depends entirely on you that which kit you want to use.
There are a variety of kits available, such as popcorn effect, orange peel, splatter and knock-down. Make sure it matches your ceiling texture.
Apply drywall compound on the area to recreate a splotchy-style texture look. Once, it is done, use texturing brushes and achieve a match to the surrounding.
Repaint the entire area, making sure that the new ceiling is similar to the surrounding. Don’t compromise on the looks because it may seem odds after getting dried.