Complex sentence: Pitts 2009 p.294 He maintained close ties to the Kennedys and their children for the rest of his life, frequently socializing with Bobby Kennedy, Jr., to whom he became almost a surrogate father, and Christopher Lawford.
Split into simpler sentences: Pitts 2009 p.294 He maintained close ties to the Kennedys and their children for the rest of his life. He frequently socialized with Bobby Kennedy, Jr., to whom he became almost a surrogate father, and Christopher Lawford.