¿que pasó en el accidente? en el accidente ricardo se rompié el brazo. en el accidente ricardo se rompí el brazo. en el accidente ricardo se rompiaba el brazo. en el accidente ricardo se rompió el brazo.

This sentence is given in the preterite tense. This tense is one of two simple past tenses. It is used to describe actions that took place or were completed at a certain point in the past. So, rompió comes from the regular verb romper that is the conjugation of the verb romper for the third person singular. Therefore, this sentence translates into:

Ricardo broke his arm in the accident.

who are you talking about?

uhm what exactly is the question?