Complex sentence: The stadium opened in 1997 as Jack Kent Cooke Stadium, in honor of the recently deceased owner of the team, and the stadium site was known as Raljon from the first names of Cooke's sons-- "Ralph" and "John".
Split into simpler sentences: The stadium opened in 1997 as Jack Kent Cooke Stadium, in honor of the recently deceased owner of the team, and the stadium site was known as Raljon. The name "Raljon" is a portmanteau of Jack Kent Cooke's sons' first names-- "Ralph" and "John".