Sequence of tenses: She said that Pushkin wrote many fabulous novels...

[Penuel]

She said that Pushkin wrote many fabulous novels. - can we use here past
simple because that is the fact known by everyone or it's better to use had
written?

[Mister Micawber]

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Simple past.　There is no call for using past perfect unless perhaps 'she' is speaking in the time of Pushkin.
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Native English teacher at Mister Micawber's

[Alan]

Hi Penuel,

If you used the past perfect in your sentence, you would then have to relate it to a previous time as in: She said he had written many novels before he reached the age of forty.

Alan
_________________
English as a Second Language
You can read my ESL story Cool Expressions

[Penuel]

Thank you very much!!!

[Penuel]

Thank you very much, would you please point any grammar references for that case.

[Mister Micawber]

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HERE is one explanation.
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_________________
Native English teacher at Mister Micawber's