Reword this text.
The immediate cause was of course the assassination in Sarajevo of the Austrian Archduke Franz Ferdinand on June 28th, 1914 by a Bosnian Serb nationalist named Gavrilo Princip.
The direct direct result, obviously, was the assassination, on June 28, 1914, by Serbo nationalist Gavroli Princip, against the Austrian Archduke Francesco Ferdinando d'Este in Sarajevo.