Complex sentence: The Marysville Pilchuck High School shooting occurred in Marysville, Washington on October 24,2014, at 10:39 a.m. PDT, when a gunman identified as freshman student Jaylen Fryberg shot five other students, killing one, before committing suicide.
Split into simpler sentences: The Marysville Pilchuck High School shooting occurred in Marysville, Washington on October 24,2014. At 10:39 a.m. PDT, a lone gunman, later identified as freshman student Jaylen Fryberg, shot five other students, killing one, before committing suicide.