Complex sentence: The Panthers-Seahawks rivalry is a National Football League (NFL) series between the Carolina Panthers and Seattle Seahawks, and will become the "next great NFL rivalry" according to "Rolling Stone" magazine.
Split into simpler sentences: The Panthers-Seahawks rivalry is a National Football League (NFL) series between the Carolina Panthers and Seattle Seahawks. The series will become the "next great NFL rivalry" according to "Rolling Stone" magazine.