Some

Determiner

  or

Coordinating conjunction

  all of

  this

Determiner

  ballast

Noun

  would

Auxiliary

  then

Adverb

  be

Auxiliary

  discarded

Verb

  when

Adverb

  cargo

Noun

  was

Auxiliary

  loaded

Verb

.

Some or all of this ballast would then be discarded when cargo was loaded.

Some or all of this ballast would then be discarded when cargo was loaded.