What is your favorite?

My favorite spotrs sport is football.

Here, "sport" should be singular "sport" not plural "sports".

I support to Arsenal FC.

No "to" needed. Just "I support (team name)"

They are in good form in this season, because of that I'm very happy. 

"Therefore" works instead of "because of that" also, but doesn't sound very natural. Also you don't need the "in". Japanese causative "から" or "ので" is less like "because" and more like "therefore" (this is confusing learning Japanese from English too).

And I like driving a car.

The activity "driving" will be understood as "driving a car" so you can leave off the car part. Adding it sounds a little redundant.

I have a car that is MINI. MINI is made in England.

Usually you would just say the type of car, especially since you already said you like driving. If you had a different car you'd still say it that way, like "I have a Mustang" or "I have a Tesla" or whatever other kind.

I have yearned for to go to foreign country countries when since I was child.

Here, "yearned for" sounds odd. You need to add the verb "to go" to connect the words here, not "for". Also, unless you mean a specific foreign country, it sounds better to say "countries" to talk about foreign countries in general. Saying "since I was a child" implies that when you were a child you began yearning to go to foreign countries and you still do now.

日本語で説明できなくてごめんなさい。もし質問があったら、聞いてください。それなら、私はもっと説明してみます。