Complex sentence: Besides evaluating the half model, the researchers also reviewed all the evidence used in the debate to date, concluding (with the help of FBI and BATF forensics) that many of the documents supporting the ship being a rebuild were forgeries.
Split into simpler sentences: Besides evaluating the half model, the researchers also reviewed all the evidence used in the debate to date. With the help of FBI and BATF forensics investigators, they concluded that many of the documents supporting the ship being a rebuild were forgeries.