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You are strictly refrained from using any language other than English here. So please stop using words in your own language. Since you are new to this forum, no blame attached.
As for your question, which were taken beforehand is a verbial clause. In verbial clauses similar to adjectival and adverbial clauses, the verb to be (were)
The sky cleared is not short form of the sky was cleared. They are two different sentences. In the former, clear is used as an intransitive verb and in the latter clear is used as a transitive one. As I already told you, clear can be used as both transitive and intransitive verbs.
The sky was cleared indicates that sth has cleared it.