Those are quite awkward to my ear. If you want to say he "had been" believed, it implies that something has changed. People no longer believe this.
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Grammar GeekHi
She had put the watch on the window sill before she realized the window was open.
The watchhashad <typo fixed> been put on the window sill before it was realized that the window was open.
Grammar Geek"For years, it has been widely believed that he was quite shy, but then in 2002, a review of his medical records-which had recently been made public-showed that he had a speech impediment, and it was that, not an inherently shy nature, that kept him from actively interacting with his peers and teacher."
Grammar GeekI'll go shoot myself now.Don't!!!