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Hola chicas aquà la explicación en inglés: When relative pronouns need to be preceded by a preposition because the verb requires it, we use a definite article (el, la, los, las) between the preposition and the relative pronoun. This article agrees in gender and number with the antecedent.
Examples:
Este es el traje con el que acudà a la inauguración. / Estas son las chicas de las que te hablé. / Las pelÃculas en las que sale Salma Hayek suelen tener mucho éxito
- This is the suit with which I attended the inauguration.
- These are the girls about whom I told you.
- The movies in which Salma Hayek appears usually have a lot of success.