Complex sentence: This meant he was in charge of all deportation matters and often came him into conflict with A. Mitchell Palmer, the Attorney General, and J. Edgar Hoover, the head of the Justice Department's "Radical Division," soon renamed the General Intelligence Division.
Split into simpler sentences: This meant he was in charge of all deportation matters-which often brought him into conflict with A. Mitchell Palmer, the Attorney General, and J. Edgar Hoover. Hoover at the time was the head of the Justice Department's "Radical Division" which was soon renamed the General Intelligence Division.