Simplify the following text for a Grade 8 native English-speaking person.
Original: Serial numbers are also used as a deterrent against theft and counterfeit products in that serial numbers can be recorded , and stolen or otherwise irregular goods can be identified .
Simplified: Serial numbers can also be used against stealing or imitating products , because it is possible to keep track of which serial numbers have been used . Stolen goods or those with problems can be identified more easily .