Complex sentence: The murder occurred on June 1,2004, at an elementary school in Sasebo, Nagasaki Prefecture, Japan, and involved slitting of Mitarai's throat and arms with a utility knife.
Split into simpler sentences: The murder occurred on June 1,2004, at an elementary school in the city of Sasebo in Nagasaki Prefecture. The murderer slit Mitarai's throat and arms with a utility knife.