An user Spanish
says…

En
Adposition
  algunos
Determiner
  casos
Noun
  tenían
Verb
  conocimientos
Noun
  de
Adposition
  medicina
💊
Noun
  y
Coordinating conjunction
  aplicaban
Verb
  sus
Determiner
  conocimientos
Noun
  cuando
Subordinating conjunction
  era
Auxiliary
  necesario
Adjective
.

In some cases they had knowledge of medicine and applied their knowledge when necessary.
Words and sentences
New
en

  1. in, at, on
  2. in (a time)
  3. in (a language)
  4. used after some verbs and translated by various prepositions in English
  5. in (in various expressions)

New
algunos

New
casos

plural of caso

New
de

New
aplicaban

third-person plural imperfect indicative of aplicar

New
conocimientos

plural of conocimiento

New
cuando

💊
New
medicina

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