Complex sentence: The most destructive tornado in the outbreak occurred on the evening of May 4 in central Kansas, as about 95% of the city of Greensburg in Kiowa County was destroyed by this EF5 tornado.
Split into simpler sentences: The most destructive tornado in the outbreak occurred on the evening of May 4 in central Kansas. About 95% of the town of Greensburg, Kansas in Kiowa County was destroyed by this EF5 tornado.