An user English
says…

Several
Adjective
  experimental
Adjective
  models
Noun
  were
Auxiliary
  also
Adverb
  developed
Verb
.

Several experimental models were also developed.
Words and sentences
New
several

New
experimental

New
models

New
were

New
also

  1. In addition; besides; as well; further; too.
  2. (obsolete) To the same degree or extent; so, as.

New
developed

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