Complex sentence: On April 9,2013, the Cy-Fair campus and seven other schools in the area were put on lock down when a student named Dylan Quick started stabbing outside of the science lab and soon went through other buildings.
Split into simpler sentences: On April 9,2013, the Cy-Fair Campus was put on lock down (as well as 7 schools in the area) as a student named, Dylan Quick. He started stabbing outside of the science lab and soon went through other buildings.