Complex sentence: Judging by the page history of that article the new article seems to be nothing more than a content fork of List of aircraft of the Bangladesh Air Force, created just after unsuccesful attempts had been made to introduce unsourced info etc into the older article.
Split into simpler sentences: Judging by the page history of that article the new article seems to be nothing more than a content fork of List of aircraft of the Bangladesh Air Force. Because the new article was created just after unsuccesful attempts had been made to introduce unsourced info into the older article.