HW: Clarification of clause type

[Alyosha]

I've been given this sentence to translate.

Rex militem quendam dona ferentem Romam misit. Qui advenisset senatoribus totam rem narravit.

My translation: The king sent a soldier bearing gifts to Rome. On arrival, he told the senators the whole story.

'On arrival' is a very loose translation. How to understand Qui+ pluperfect subjunctive? I don’t think it’s a purpose clause. Does qui fulfil the same job as cum +subjunctive? I only have these two sentences so I don’t know the context.

 

[Notascooby]

I suspect a cum has fallen out after qui for some reason. Seems like an error.

 

[kizolk]

I suspect a cum has fallen out after qui for some reason. Seems like an error.

I did a Google search for "Rex militem quendam dona ferentem", and found "rex militem quendam dona ferentem Romam misit. qui cum advenisset, senatoribus totam rem narravit", apparently from Essential GCSE Latin.

 

[Alyosha]

Thanks a lot! Now it makes sense.