I feel like there is something wrong with this sentence but can't say what:
Wiktor Zwikiewicz is - I'm not afraid to say - one of the world's best Sci-Fi writers of all times, unfairly not widely enough acclaimed and living in a shadow of Stanislaw Lem.
Wiktor Zwikiewicz is ,I'm not afraid to say, one of the world's best sci-fi writers of all time; unfortunately not widely acclaimed, and has been living/has lived in the shadow of Stanislaw Lem.
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Wiktor Zwikiewicz is ,I'm not afraid to say, one of the world's best sci-fi writers of all time; unfortunately not widely acclaimed, and has been living/has lived in the shadow of Stanislaw Lem.