The grammar of the sentence is correct. 'Something' is singular, so it causes a huge amount of... If it helps to analyse it as subject-verb-object, then "A catastrophic event" is the subject, "is" is the verb, and "something that causes a huge amount of damage and suffering" is the object.
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Carter LeeA catastrophic event is something [that causes a huge amount of damage and suffering].I ran across on the web 2 sentence what I can't understand gramma.I ran across two sentences on the web, and I can't understand their grammar.
Carter LeeAs I know, when we use relative clause in sentence, the relative clause is made like this " S+V that S+V". But my sentence are not using this form "S+V that V".The relative clause is relative-word + S + V, where the subject may or may not be the relative word 'that', 'who', or 'what', etc.