This is the 11655th most frequent Turkish word.
filmlerinin
"Of his/her/its/your/their films"
In this sentence, 'filmlerinin' is used in the genitive form combined with a possessive suffix, referring to the movies that belong to the artist.
Sanatçının filmlerinin başarısı herkes tarafından biliniyor.
The success of the artist's movies is known by everyone.
Here, 'filmlerinin' again shows possession, referring to the plots belonging to the movies of the director.
Bu yönetmenin filmlerinin konuları oldukça etkileyici.
The plots of this director's movies are quite impressive.
In this case, 'filmlerinin' indicates the movies that belong to the actors, emphasizing the possessive relationship.