Complex sentence: Exner also said that Kennedy brought prostitutes to the White House swimming pool; journalists, such as Seymour Hersh, and historians have documented Kennedy's numerous affairs; a memo by J. Edgar Hoover on the topic is part of the evidence.
Split into simpler sentences: Exner also said that Kennedy brought prostitutes to the White House swimming pool. Journalists such as Seymour Hersh, as well as historians, have documented Kennedy's numerous affairs; a memo by J. Edgar Hoover on the topic is part of the evidence.