Complex sentence: Landgraf graduated in 1999 from Permian High School in Odessa and then in 2003 Texas A&M University in College Station, where he was a member of the Corps of Cadets.
Split into simpler sentences: Landgraf graduated in 1999 from Permian High School in Odessa. In 2003, he graduated from Texas A&M University in College Station, where he was a member of the Corps of Cadets.