Correct sentence: The experimental novel—which blends elements of poetry and prose—is a challenge to traditional notions of storytelling and narrative structure, but it will have been widely accepted by the time it is recognized as a masterpiece.

Correct sentence: The experimental novel—which blends elements of poetry and prose—is a challenge to traditional notions of storytelling and narrative structure, but it will have been widely accepted by the time it is recognized as a masterpiece.

Explanation
Sentence Correction
  • The experimental novel—which blends elements of poetry and prose—is a challenge to traditional notions of storytelling and narrative structure, but it will be widely accepted by the time it is recognized as a masterpiece.
Explanation
In this sentence, the error is the incorrect use of Will Have Been” (Future Perfect Tense).
We use “will have been” (future perfect) only when emphasizing that action will be completed before another future event.