Hi,
I wonder how past perfect is used in longer narratives. Let me pull a case in point:
"I went fishing this morning. Before I went fishing, I had gone to a shop..." And now, shall I use the past simple or the past perfect when continuing with ... "I bought / had bought a few apples there."
The word 'before' makes the sequence of events very clear without the past perfect, so it would be common to say it this way. (I've also made a few other chnages to make the narrative flow more smoothly.)
"I went fishing this morning. Before that, I went to a shop where I bought a few apples."
Without 'before', the past perfect serves to make the sequence clear, eg
"I went fishing this morning. I had gone to a shop where I bought a few apples (so I didn't get hungry while I was fishing)."
As shown in the above example, the past perfect also shifts the reader's attention temporarily in time, and then allows the attention to shift back to the main time featured in the narrative. Compare
"I went fishing this morning. Before that, I went to a shop where I bought a few apples. While I was in the shop, I saw my friend Tom. He was buying some paint. He told me that . . . ". Here, the reader's attention is shifted back in time from "the fishing time" to "the store time", and allowed to stay there.
Best wishes, Clive