Complex sentence: Major General Francis S. Greenlief (July 27,1921--December 19,1999) was a United States Army Major General who served as the 18th Chief of the National Guard Bureau.
Split into simpler sentences: Major General Francis S. Greenlief (July 27,1921--December 19,1999) was a Major General in the United States Army. He served as the 18th Chief of the National Guard Bureau.