Complex sentence: Super Bowl LI is also the Patriots' ninth Super Bowl appearance, the most Super Bowl appearances of any team, their second appearance in three years, and their seventh under the leadership of head coach Bill Belichick and quarterback Tom Brady.
Split into simpler sentences: Super Bowl LI is also the Patriots' ninth Super Bowl appearance, the most Super Bowl appearances of any team. It is also their second appearance in three years and their seventh under the leadership of head coach Bill Belichick and quarterback Tom Brady.