Choose an event small enough to explain in a minute: missing a bus, finding a lost notebook, or preparing a meal. Begin with the setting: "Yesterday afternoon, I was waiting for the bus outside the library." The listener now knows when and where the story starts.
Introduce the event that changed the situation: "When the bus arrived, I realized I had left my bag inside." Explain your response and result: "I went back to the desk, and the librarian had kept it for me."
Keep the central sequence visible
You do not need every detail about the weather or the building. Include background only when it explains an action. "The next bus was an hour later" matters if it explains why you called a friend.
When the order differs from the order of telling, mark it clearly: "Earlier that morning, I had put my ticket in the bag." Do not add complicated verb forms just to make the story sound advanced; use forms you can control and revise unclear timing afterward.
Ask a partner to summarize what happened first and what happened last. If their order differs from yours, add a time phrase or divide a crowded sentence. Repeat the story once with fewer notes, preserving the same facts while allowing the wording to change naturally.