Report to be released on use of restraint chairs
The chairs have been used in numerous Iowa counties and elsewhere around the
country since then, and have been blamed for serious injuries and deaths
among prisoners.
country since then, and have been blamed for serious injuries and deaths
among prisoners.
The comma after "then" should be removed, because the second half of the sentence is not an independent clause. The subject of "have been blamed" is "chairs" at the beginning of the sentence.