But

Coordinating conjunction

  he

👨

Pronoun

  kept

Verb

  quiet

Adjective

,  because

Subordinating conjunction

  he

👨

Pronoun

  had

Auxiliary

  heard

Verb

  what the

  alchemist

Noun

  said

Verb

  to the

  monk

Noun

.

But he kept quiet, because he had heard what the alchemist said to the monk.

But he kept quiet, because he had heard what the alchemist said to the monk.