A few errors: Main Clause: The subject of the main clause is "The STS Utilization and Operations Office at NASA’s Johnson Space Center (JSC) in Houston". The two prep phrases are modifiers of "The STS Utilization and Operations Office", not adverbials (adverbials modify verbs and VPs, not nouns) The verb phrase is "had prepared the document", in which "the document" acts as object. Relative Clause: The verb phrase is "was meant to be revised quarterly".
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