You have to split the big files on you PC.
Use OpenSplit 1.2
Put the game on an external Fat32 HDD.
Plug it into your PS3 and copy it with multiMAN to your internal.
Multiman will put the splitfiles together again.
Splitgames will only work on your internal.
Tutorial for multiMAN: (All Versions)
1. Start multiMAN (Dont need LV2 anymore)
2. Choose your desired game on multiMAN.
3. Mount the game with a click on X.
4. Say NO to a start without going to XMB.
5. Now you are on XMB. Click the disk/game icon and have fun.