Zgodność z umową została wczoraj sprawdzona.

From Lesson 486:Abstract noun cases·Polish

Questions & Answers about Zgodność z umową została wczoraj sprawdzona.

How does noun government work with the word zgodność in this sentence?
The abstract noun zgodność (compliance or conformity) requires the preposition z followed by the Instrumental case, which is why we see z umową. This stems from its related verb zgadzać się (to agree), which also takes z + Instrumental (zgadzać się z czymś).
Why do we use została here instead of była for the word "was"?
We use została because this is a perfective passive voice construction. The action of checking was completed yesterday. If we used była, it would pair with an imperfective participle (była sprawdzana) to mean the compliance "was being checked" over a period of time.
Why do both została and sprawdzona end in -a?
They must agree in gender with the subject of the sentence, zgodność. Almost all abstract nouns ending in the suffix -ość are feminine in Polish, so the auxiliary verb and the passive participle both take the feminine singular -a ending.
Is it mandatory to put wczoraj between the two verb parts (została wczoraj sprawdzona)?
It is not mandatory, but it sounds very natural. In Polish, short adverbs of time or manner are frequently "sandwiched" between the auxiliary verb and the participle. Saying została sprawdzona wczoraj is also grammatically correct but puts slightly more emphasis on the fact that it happened yesterday.

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