An user German
says…

Diese
Determiner
  waren
Auxiliary
  zunächst
Adverb
  in
Adposition
  sehr
Adverb
  einfachen
Adjective
  Käfigen
Noun
  untergebracht
Verb
.

These were initially housed in very simple cages.
Words and sentences
New
diese

  1. nominative feminine singular of dieser; "this"
  2. accusative feminine singular of dieser; "this"
  3. nominative plural of dieser; "these"
  4. accusative plural of dieser; "these"

New
waren

first/third-person plural preterite of sein

New
zunächst

  1. first, first of all, in the first place, to begin with, initially
  2. for now, for the time being
  3. next, then, secondly (immediately following the first thing)

New
in

New
sehr

  1. very
  2. a lot, much

New
einfachen

  1. inflection of einfach:
  2. inflection of einfach:
  3. inflection of einfach:
  4. inflection of einfach:
  5. inflection of einfach:

New
Käfigen

dative plural of Käfig

New
untergebracht

past participle of unterbringen

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