The correct answer to this open question is the following.
Desafortunadamente no incluiste el texto o la afirmación de referencia para poder responder a tu pregunta.
Sin embargo, podemos incluirte dos afirmaciones con los pronombres relativos.
1.- He is the teacher who is the youngest of all in school, that graduated from Florida University, whose teachers were actors of the Broadway scene.
2.- She is the manager that helped me resolve my problem which allowed me to reduce the interests of the debt, in a time where I was out of the city.
The most common relative pronouns are: who, whose, whom, where, which, and that.