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"Splitting" a VGA signal, either using a cable like you did or a vga signal splitter box like this one can only duplicate the image:
https://www.amazon.com/Distributor-Amplifier-Ch...
The VGA standard simply does not allow you to "daisy chain" multiple monitors showing different images through a single port. Not enough "bandwidth".
To "extend" the desktop to show different images on the 2 monitors you will need a USB to VGA adapter like this one:
https://www.walmart.com/ip/THZY-USB-3-0-to-VGA-...
This allows you to plug a VGA monitor into a USB port and have Windows recognize it.
First thing to determine is if you have USB version 2 or USB version 3 port(s). Older computers only have USB 2. Many newer computers have a mix of both. Confirm if the a USB3 version of the adapter will work in a usb2 port, some will, some won't. (Buy USB 3 if possible, for use on future computers and monitors)
Note: the links are quickly found examples, they are not specific recommendations. You should do your own research to find the best features and price.
Do either of your monitors have any other video input ports, ie HDMI / DVI / DisplayPort etc ? If you do, buy an adapter for those newer port types so you will have the option of using the adapter on a newer computers and monitors.