Anyone who didn't know it before should have learned that ba

Anyone who didn't know it before should have learned that bad things can happen
before这里是副词,“以前”的意思,作时间状语修饰它之前的部分.
这是个简单句anyone是主语,后面who引导定语从句修饰它
Anyone who didn't know it before 整体是主语部分,意思是之前不知道这个的人
should have learned that bad things can happen谓语及宾语
整句翻译：以前不知道这个的人应该了解（学会）：坏事总会发生.

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Anyone（主语） who didn't know it before（定语从句修饰anyone, before作时间状语） should have learned （谓语）that bad things can happen（宾语从句）.