Translation:The actor who paid you money will come soon.
It's a grammar concept called participles! It's basically when a verb has an adjectival ending, so the verb is being used as a description of the subject rather than the main action of the subject. In this case, the main action of the subject (the actor) is that he is coming--not that he is paying you. So the verb "to pay" is being used more like an adjective ("the actor who paid you money"), hence the adjectival ending. Google participles, it'll help! :)