In sentence one, the identifiable clause is: Do the task because it was not complex. In the second sentence, the identifiable clause is: "You have submitted the assignment".
A clause is a group of word containing a verb and and a subject that are related. These words are coherent and related and gives an idea on the sentence.
In the two sentences, "do the task because it was not complex" gives us the verb to do and reason why the task was not complex. It gives an idea on the whole sentence. And in the second sentence, "you have submitted the assignment" is the sentence clause.
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