You rip the card one more time and when you are done, you fan the pieces to make everyone see that there are three pieces of one card in your hand. You can even call someone in the audience to check it and then when you set the torn pieces on the table, you take away the loose piece using your thumb and hide this in your hand by using a finger palm move.
With one hand, you make the second card come out which was never torn in the first place appear out of nowhere which can be examined by the person you called earlier and be surprised to see that the card has been restored to its original form. As for the torn card that is hidden in the other hand, quickly slide this in your pocket and bring your hand out so no one will know that you made a switch.
The torn and restored magic trick can be performed in 6 simple steps. Don’t expect to learn it overnight since it will take time to master since you have to make sure that the torn area is proportionate with the one you will make everyone believe you will tear later. Otherwise, they will notice the difference and your people will know that you made a switch.
If you what to learn more magic tricks like this one, do some research by buying a book or looking for this in the web. Most of the information can be downloaded for free so you can practice as many tricks as you can and impress whoever is watching.