Complex sentence: Of that period the best known today is the Graham-Newman Partnership, founded by Benjamin Graham and Jerry Newman, which was cited by Warren Buffett in a 2006 letter to the Museum of American Finance as an early hedge fund.
Split into simpler sentences: Of that period the best known today is the Graham-Newman Partnership, founded by Benjamin Graham and Jerry Newman. This was cited by Warren Buffett in a 2006 letter to the Museum of American Finance as an early hedge fund.