If an author tells a story about Sharon purchasing new car and then interrupts that to tell another of why got which narrative technique is the using?

Here's why:

* The Story Interruption: The main narrative about Sharon buying a car is interrupted.

* The Reason for the Interruption: The interruption is to tell a story about *why* Sharon got the car, suggesting a past event is being brought into the present narrative.

* The Effect: This technique adds depth and complexity to the story by giving context to Sharon's present actions. The reader learns more about her motivations and backstory.

Let me know if you'd like to explore other narrative techniques!