Okay! Let's break this sentence into two parts.
First, when we say, 'The horse is fast!', it means the horse can run really quickly. Imagine a horse running like the wind, and how exciting that would be!
Next, when we say, 'As if inviting to take a ride.', it's like the horse is saying, 'Come hop on my back and let's go for a fun ride!' It feels like the horse wants you to have fun and go on an adventure with it!
So, together, the sentence tells us that the horse is not just fast, but it also seems like it's ready for you to join it for a ride. Isn’t that cool?