The Buffalo News is the daily newspaper of the Buffalo–Niagara Falls metropolitan area, located at 1 News Plaza in Downtown Buffalo, New York. The paper is owned by Warren Buffett's Berkshire Hathaway. It was for decades the only newspaper fully owned by that company.
The Buffalo News is the only paper owned by Berkshire Hathaway.
The paragraph says that it was the only paper owned by Berkshire Hathaway for decades which implies that other papers are now owned as well