Either way you need to use some imaging software to do that ,and another opertaing system (preferably a 'livecd') that contains the drivers of that raid controller.
Then you're able to move the disk from the raid instance to any other disk (sata.other raid,etc.) .
The difficult part is to adapt the OS installed to make sure it's reading the correct device ,and also to adapt the Grub loader so that it'll search for the file located on the disk connected to the sata controller.
A bit of googling gave me some answers :
Here it explains how to migrate a physical disk to a vm instance , but it boils down to the same.
Make sure you create a proper backup before trying anything.
How to make a backup with clonezilla : linuxgravity.com/creating-and-restoring-...-disk-with-clonzilla
Hope this helps.