Complex sentence: Martin Peyerl (August 11,1983--November 1,1999) was a German student who, on November 1,1999 (the day of All Saints), fired from his bedroom window, killing four people and wounded seven others before committing suicide.
Split into simpler sentences: Martin Peyerl (August 11,1983--November 1,1999) was a German student. On November 1,1999 (the day of All Saints), he fired from his bedroom window, killing four people and wounded seven others before committing suicide.