Simplify the following text for a Grade 8 native English-speaking person.
Original: Tourette syndrome ( also called Tourette 's syndrome , Tourette 's disorder , Gilles de la Tourette syndrome , GTS or , more commonly , simply Tourette 's or TS ) is an inherited neuropsychiatric disorder with onset in childhood , characterized by multiple physical ( motor ) tics and at least one vocal ( phonic ) tic ; these tics characteristically wax and wane .
Simplified: Tourette syndrome can also be called Tourette 's syndrome , Tourette 's disorder , GTS , Tourette 's , or TS . People that have Tourette 's have tics ( movements or sounds that the person can not easily control ) .