CLC Stage 40: Translating QUI - relative, correlative, or purpose
(5th edition, revised 2018)
1) As a relative pronoun, qui, quae, quod usually means WHO or WHICH. When it does, the noun immediately in front of qui, quae, quod is the ANTECEDENT.
2) HOWEVER, sometimes the relative pronouns qui, quae, quod will come at the very beginning of a sentence, not to indicate WHO or WHICH, but to RELATE the current sentence to the persons or events of the previous sentence. In that instance, translate as ET (and) plus a typical personal pronoun (he, she, it, etc) or a demonstrative (this, these, etc).
3) IF there is a SUBJUNCTIVE verb, it is a QUI PURPOSE clause, which you can translate as "in order to" or "to". (It is used to indicate that the direct object of the main clause is now the subject of the purpose clause--kind of like using ille to indicate that we've switched subjects.)