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Could you tell me if there are any mistakes? Any suggestions for an improvement are welcome.

The author chose a third-person omniscient narrator, as he can tell feelings of evey character. He gives a paranomic view of the world of the story, looking into many persons and into the broader background. That really applies to our story The background and the sadness of John Carmody are described very precise.
The audience receives all the sad feelings. That's why the third person omniscient narrator is a good choice.

Thanks,

Alex
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I have changed some, which I hope is your intention:

The author chose a third-person omniscient narrator to reveal the feelings of every character. He gives a paranomic view of the world of the story, looking into multiple characters and into the broader background, which is very germane to the storyline. The background and the sadness of John Carmody are described very precisely.

The reader can empathize with all the sad feelings, and that is why the third-person omniscient narrator is effective.
Comments  
Hi Alex!
The author chose a third-person narrator because of the character's omniscience. He gives a paranomic view of the story world, looking into many persons' background from the broader point of view. So John Carmody's background and his feeling of sadness are described very precisely. As the result, the audience receives all the sad feelings the athour wanted from them.

Something like that...
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 Mister Micawber's reply was promoted to an answer.
Yes, It was my intention. I really appreciate your help. Thanks so much!