No matter how far apart or distant they may stand in the sentence, subjects and verbs still must agree with one another in number (singular or plural).
A car with many riders runs slower.
Cars with many riders run slower.
Many riders ride fast cars.
Many fast cars run over many riders.
The rider the other riders talk about rides fast cars.
The riders that rider talks about ride fast cars.
Tadeu and Júlia ask a passerby for directions.
A passerby asks Tadeu and Júlia for directions.
Tadeu, Júlia and the passerby drink beer at the corner bar.
The corner-bar owner feels bad for the riders the fast cars ran over.
The riders the fast cars ran over felt bad for the corner-bar owner because he failed to attend their funerals.
You and XYZ have to shovel out Schultz's brand-new, snow-covered Corvette. Start doing it now.
 And plural compound subjects which include noun phrases or singular and plural personal pronouns.