Complex sentence: He attended Severn School in Severna Park, Maryland, and The Principia in St. Louis, Missouri, and graduated, in 1953, from Principia College in Elsah, Illinois.
Split into simpler sentences: He attended Severn School in Severna Park, Maryland and The Principia in St. Louis, Missouri. He graduated, in 1953, from Principia College in Elsah, Illinois.