This would be the best organizational choice for a short story. Chronological order refers to describing a series of events in the same order in which these events happened. This is the most common way of writing a narrative, because it allows the reader to connect all the events in a way that shows the progression of time and the relationships of cause and effect between the various events.
"Because" is acting as a subordinating conjunction. A subordinating conjunctions will combine two independent clauses into one sentence, making it a complex sentence.
