How can I play The Sims Complete Collection without PowerPC applications being supported?

So I downloaded Mavericks a while ago after my friend told me it was a really good idea. I hated almost everything about it to start with and since then I've found I don't hate everything but still a lot of things. I was on Snow Leopard before and, even though it was old, it was lovely; I knew where I was with it and everything worked.

Today I went to play The Sims Complete Collection for the first time since downloading Mavericks a few months ago and it told me 'You can't open the application "The Sims Complete because PowerPC applications are no longer supported." I am SO ANGRY. I would quite happily buy the game again but they don't make them anymore so they'd all have the same system requirements. What's most frustrating is that I sold all my original edition Sims games that I'd been collecting for years to buy Complete Collection for Mac so I could still play the game I've played since the week it was released. Basically I need someone to tell me how to do one of these things;

1- Downgrade to Snow Leopard again. Bit extreme but I like the Sims a lot. I have the original discs that came with my macbook if that helps at all.

2- Don't think it can be done but is there a way I could have my Sims Complete Collection on my EA origins app? Like all my Sims 3 are.

3- Make PowerPC Applications playable

4- Basically anything that makes my game playable!