Does the following passage contain a fused sentence error?

Fyodor spent eight years doing hard labor he wasn’t allowed to read or write anything.

Yes, the following passage contains a fused sentence error.

Yes, the following passage contains a fused sentence error. A fused sentence occurs when two independent clauses are joined together without any punctuation or conjunction to separate them. In the given passage, "Fyodor spent eight years doing hard labor" and "he wasn’t allowed to read or write anything" are two independent clauses that are merged into a single sentence without proper punctuation or conjunction.