The

Determiner

  structure

Noun

  was

Auxiliary

  of

Adposition

 all-metal  construction

🚧

Noun

,  which

Pronoun

  was

Auxiliary

  then

Adverb

 fabric-covered.

The structure was of all-metal construction, which was then fabric-covered.

The structure was of all-metal construction, which was then fabric-covered.