The Simple Preterite indicates an enunciated action that is considered finished. It applies to actions completed in the past that are not necessarily related to the factual status of the present situation.
It is used in Spanish to express: actions that take place at a certain moment in the past in a timely manner or a new action that occurs in the past and that interrupts a course of action that was already in progress and that is expressed in the past tense
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On the other hand, the imperfect past tense of the indicative describes an action or state in the past whose time limits are not relevant, that is, a grammatical time of the past with a grammatical aspect. It is used in Spanish to express courses of past actions whose beginning and end are not specified
