How do your conlangs handle relative clauses?

Relative clauses are things like this:

"I like what I saw" "The man, who had been running for a long time, arrived at his home"

For a more specific meaning, I'm gonna quote wikipedia.

A relative clause is a clause that modifies a noun or noun phrase and uses some grammatical device to indicate that one of the arguments in the relative clause refers to the noun or noun phrase.