YOU SAID:
driving is hard, not knowing if the person you're racing is a tough obstacle
INTO JAPANESE
あなたがレースをしている人が難しい障害であるかどうかわからないので、運転は難しいです
BACK INTO ENGLISH
Driving is difficult because you don't know if the person you are racing is a difficult obstacle
INTO JAPANESE
あなたがレースをしている人が難しい障害物であるかどうかわからないので、運転は難しいです
BACK INTO ENGLISH
Driving is difficult because you don't know if the person you are racing is a difficult obstacle
That didn't even make that much sense in English.