Mr. Frank says this line when they are all fighting.
He is saying that they don't need the Nazis to destroy them. They are destroying themselves by fighting. In this scene, they were fighting over food, which was certainly important -- however, Mr. Frank is saying that the good of all must be considered before individual needs.
Mr. Frank is saying that in order to survive, some sacrifice must be made, and the fighting must be stopped.
"What a beauty!" exclaimed Susie.
Hope this helped.
If we say simple predicate, this only refers to the main verb that is used in the sentence. So based on the given sentence above, the simple predicate is the word "arrived" and this is the main verb which describes the subject which is "nurse". Hope this answers your question.
