Betty isn't very tall, but she can run very fast - Although ....
Although Betty isn't very tall, she can run very fast.
It's rather cold, but I think I'll go for a walk - Even though ....
Even though it's rather cold, I think I'll go for a walk.
The luggage was heavy but she managed to carry it herself - Despite ...
Despite the fact that the luggage was very heavy, she managed to carry it herself.