Complex sentence: He attended The McCallie School in Chattanooga, Tennessee, and after graduating he attended Tulane University in New Orleans and during World War II trained at a U.S. Navy facility on the campus of the University of the South in Sewanee, Tennessee.
Split into simpler sentences: He attended The McCallie School in Chattanooga, and after graduating he attended Tulane University in New Orleans. During World War II, he trained at a U.S. Navy facility on the campus of the University of the South in Sewanee, Tennessee.