Simplify the following text for a Grade 9 native English-speaking person.
Original: By adverse possession , title to another 's real property can be acquired without compensation , by holding the property in a manner that conflicts with the true owner 's rights for a specified period .
Simplified: Adverse possession is a rule in property law . This rule says that if property is not being used by its owner while another person is using the property , this other person ( called an `` adverse possessor '' ) becomes the new owner of the property .