1. She has flown on three shuttles. The shuttles were Discovery, Atlantis, and Columbia.
2. She was the first woman to earn the Congressional Space Medal of Honor. This award is given by the President of the United States.
I'm writing with nouns and have to combine these sentences.
1. She has flown on three shuttles and they were Discovery, Atlantis, and Columbia.
2. She was the first woman, given by the President of the United States, to earn the Congressional Space Medal of Honor.
Your first sentence is o.k. but could be better if you had used an appositive.
http://www.chompchomp.com/terms/appositive.htm
The second is terribly wrong. The woman was not given by the President.
1. She has flown, the Discovery, Atlantis, and Columbia, on three shuttles.
Would this be an appositive?
No.
Study that website again.
1. She has flown three shuttles, the Discovery, Atlantis, and Columbia.
Yes! That's right!
Now what will you do with the second sentence?