material that is organized is better remembered than jumbled information.

本句的“that is organized”做定语，修饰前面的material,而第二个is则是句子的谓语动词。

第二个is 是“material that is organized”整个的谓语

material that is organized主语，is谓语，前面一个是that引导的从句

第二个is是主句的谓语啊。