Tokyo Gov Yuriko Koike will replace several ranking officials involved in the relocation of the Tsukiji wholesale market to a site lacking a sufficient soil barrier underneath the main structures to protect them from toxic contaminants.
S: Tokyo Gov Yuriko Koike 小池氏
V: [will replace] 取り替える
O: (several ranking) officials 関係者、担当
→どんな [involved]
officials →どんな
V: [involved] 関与した（含まれた）
補足
[in] the relocation 移転 →どんな [of] the Tsukiji wholesale market
[in] the relocation 移転 →どんな [to] a site サイトへ
→どんな [lacking]
V: [lacking] 足りない
O: (a sufficient soil) barrier 十分な土のバリア
[lacking] barrier バリア
→どんな [underneath] the main structures メイン建物下の
→どんな [to protect]
V: [to protect] 保護する
O: them 建物
補足
[from] toxic contaminants 有毒汚染