Combined driving is like a really fun game that people play with horses and carriages. It's kind of like a horse race, but instead of just running really fast, the horse (and sometimes even the driver) has to do all sorts of cool tricks and challenges!
In combined driving, the horse pulls a carriage (called a "carriage" or "cart") that the driver sits on. The driver gives the horse directions on where to go, and the horse has to try its very best to follow those directions. But in combined driving, there are also other things that the horse and driver have to do, like weaving through cones, going over jumps, and even backing up!
It's kind of like playing a video game, where you have to avoid obstacles and complete challenges to win. The person who does all of these things the fastest and most accurately is the winner!
So if you ever see people riding around in horse-drawn carriages and doing all sorts of cool things, they might be playing the game of combined driving!