display port can do chaining of monitors, but not hdmi, or vga.
witrh a passice vga splitter you'd end up with two identical displays, is this a desktop or laptop, if the former you could but in an extra PCIe display card (subject to free slot) if a laptop there are USB monitors available.
Is this because the monitors only have VGA and not HDMI (you can get HDMI splitters as well)?
If you are splitting a single display adaptor output, you will only ever[1] get duplicates. To have a second separate logical screen, you will need a separate display adaptor that the OS (windows presumably) can render two.
[1] possible exception for some recent display port compatible kit.
Without knowing more info about what equipment you have its hard to give particularly targetted advice.
However most computers made in the last few years will have two or more display outputs, and many can drive them independently to allow multiple logical screens that the OS can address. So for example its quite common to find VGA and HDMI, or VGA and DVI. Sometimes all three.
If your computer does not have multiple outputs, then adding a new/additional display card will add one or more. With laptops you can get USB2/3 based display adaptors.
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