My first thought is to consider what perspective these passages are being written from. There may not be enough information to make a conclusion, or there may be in the earlier versions of the story, but if you could figure that out, it might help. For example, if it were Elendil or some other man writing about the fall of Numenor, or even perhaps Elrond, it might sound like that.
In the earlier versions of the Silmarilion it is written as a story being told, but once that idea was abandonned it never really got rewritten stylistically, thats why I suggest this.
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