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A survey was written by the company. (sentence) (past tense)
A survey written by a company (phrase). (no tense)
A survey written by a company suggested there were faults in the business.
Does this last example require (which was) written by a company. Is it just the writers choice. Isn't the meaning the same?
It was a survey written by a company. (Is **it* the subject or survey) ?
It is common in English to leave out the "which/that is/was/are" of a relative clause, even in formal writing.
A survey which was written by a company -> a survey written by a company.
This process is known to linguistics as Whiz deletion
