4. 田中前外相の更迭に続く政治混乱がその象徴である。
Translation given: "The dismissal of foreign minister Tanaka is symbolic of the continuing political turmoil."
I can't understand the structure of this sentence. To me it looks like 続く政治混乱がその象徴である means "the continuing political turmoil is the/that symbol", and 田中前外相の更迭 means "the dismissal of former foreign minister Tanaka", joined by に in some relationship that I can't figure out. However, according to the translation Tanaka, not the turmoil, is the symbol.