Analyze the advanced syntactic structures and temporal alignment in the following complex sentence containing multiple subordinate clauses and conditional markers:"Had the principal investigator anticipated the methodological flaws in the preliminary data, she would have suspended the clinical trials before the regulatory board had intervened with a formal injunction."Identify whether the underlined verb phrases require grammatical modification according to standard English tense-aspect rules.

In an inverted third conditional sentence expressing a counterfactual past scenario, the main clause correctly takes the modal perfect form ('would have suspended'). However, in the time clause introduced by 'before', when referring to a specific completed event in the simple past that occurred subsequent to or at a point cutting off the main action, the simple past tense ('intervened') should be used rather than the past perfect ('had intervened'), as the past perfect is redundant when 'before' already establishes chronological precedence. For further insights on how clauses interact temporally, consult the Wikipedia Reference on English conditional sentences.