The circumstances in which it was decided that there was a legal basis for military action were far from satisfactory. in which 用法？

in which = where，是「介系詞＋關係代名詞」＝「關係副詞」，帶出一個形容詞子句，當作先行詞circumstances的「修飾語」。it是虛主詞，形容詞子句的delayed subject（延遲主詞）是there was a legal basis for military action 。

這個complex sentence的主要子句是 The circumstances were far from satisfactory.

in which=where;for which=why;
"that it was decided that"----the subject was delayed and as for adj.clause cause/reason.
In the complex sentence has shown:-SVO after several words had been deleted from the sentence.軍事行動--(疑問)在哪裏,在哪一點;去哪裏?到哪兒去?關係where無先行詞,This is where I live.;That's where it is.That's just where you are wrong.----及subordinate clause都是時候要用-------
The circumstances
were
unsatisfactory.

The circumstances in which it was decided that there was a legal basis for military action were far from satisfactory.
The subject==The circumstances
The prepositional and relative pronominal clauses==in which it was decided that there was a legal basis for military action;
The verb==were
The adverbial phrase ==far from satisfactory.
Yip