the word "before" helps to understand the sequence of events. Past perfect or simple past are equally OK.
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YankeeI agree that the words already and before make the order of events clear.
However, there is a difference if 'had been broken' is used instead of 'were broken'. In the phrase 'were already broken', the word 'broken' is clearly an adjective and 'were' is the simple past tense, active voice of the verb 'be'. There is no