There's a big difference between how people define common sense nowadays and what people thought common sense was a long time ago.
ーThere's a big difference between how people define common sense nowadays and what people thought common sense was a long time ago.
「最近の人たちがどのように常識を定義するかと、昔の人たちの考える常識には大きな違いがある」
big difference で「大きな違い・大きな差」
to define で「定義する」
common sense で「常識」
ご参考まで！
カナダ 
