Thats good!!!!
I would see if any one you know has a 10 or 12in miter saw that you can borrow. If not I have one you can borrow but were kinda far apart. I would deconstruct the swing set and make exact copys of the broken peices. Shouldn't be to hard there are not many complicated cuts on a swing set. If we were closer I would swing by and give you a hand but traffic is a nightmare down that way.
Forgot to add like another poster said I would add simpson brackets to reinforce it so you dont have this problem again. They are only a few bucks and will make it 10 times stronger.