He decided to become a writer when his first story had been published
He decided to become a writer when his first story WAS published
Edited* * *
The past perfect doesn't sound natural in this sentence. It normally refers to something that happened BEFORE a point in the past. However, here, something happened AT a point in the past: his story was published and he decided to become a write AT THAT POINT in time, not before.
он решил стать писателем, когда его первую историю опубликовали
I understood that it is preferable to seek assistance with this. And so I decided to pay someone to write a literature review. For me, this was the perfect answer to all of my concerns For me, such tasks have always been particularly difficult, so I think that this is the best solution to all problems.