Complex sentence: Stephenson's family moved to Champaign-Urbana, Illinois, in 1960 and then in 1966 to Ames, Iowa, where he graduated from Ames High School in 1977.
Split into simpler sentences: Stephenson's family moved to Champaign-Urbana, Illinois, in 1960 and then in 1966 to Ames, Iowa. He graduated from Ames High School in 1977.