Complex sentence: Operational groups assigned to the wing were the 6th and 9th Bombardment Groups, both were existing units with the 6th being reassigned from the Sixth Air Force in the Caribbean, where it was performing antisubmarine missions and protecting the Panama Canal from airfields in Panama.
Split into simpler sentences: Operational groups assigned to the wing were the 6th and 9th Bombardment Groups. Both were existing units with the 6th being reassigned from the Sixth Air Force in the Caribbean, where it was performing antisubmarine missions and protecting the Panama Canal from airfields in Panama.