Simplify the following text for a Grade 12 native English-speaking person.
Original: In this system , described in his collections of essays Totem and Taboo , Freud postulates a link between forbidden behaviors and the sanctification of objects to certain kinship groups .
Simplified: In this system , described in his collection of essays Totem and Taboo , Freud says there is a link between forbidden behaviors and the sanctification of objects to certain kinship groups .