Hold on, let me make sure I've understood this correctly:
You have one laptop with one VGA Output, you have connected this to your monitors VGA Input, on that monitor you also have a second VGA Output which you have connected to a second monitors VGA Input?
Unfortunately you won't be able to run two seperate displays like this, the graphics card shall only output to one monitor, whether you extend or duplicate your displays. It is up to the first monitor to extend or duplicate your displays.
Is this what you mean, good luck regardless.