Simple Past and Past Progressive used together.

2. To talk about the circumstances surrounding an event in the past. This means
that it gives us the context information, or the background of the main narrative
actions.
Imagine it as a photograph. It gives us the details of the actions, but there is no
movement.

4. It’s used to indicate the events that interrupt the background actions. Actions in
Simple Past are the main actions, or the narrative actions. These are the verbs
that make the story advance.
Imagine it as a movie. It gives the story movement.