You'll

  use

Verb

  your

Pronoun

  knowledge

Noun

  for

Adposition

  the

Determiner

  welfare

Noun

  of

Adposition

  the

Determiner

  oasis

Noun

  and

Coordinating conjunction

  its

Pronoun

  inhabitants

Noun

.

You'll use your knowledge for the welfare of the oasis and its inhabitants.

You'll use your knowledge for the welfare of the oasis and its inhabitants.