Electrical – Splitting strain gauge signal before amplification

I have a strain gauge full bridge force sensor with 3mV/V sensitivity and power it with 10 V excitation, giving up to 30 mV output. Normally the output is connected to a 3rd party device's strain gauge input (call it device "X"). That device can't plot the force during measurement, so I want to show the real time data in a different device. That is why I need to get the signal. I have 2 ideas:

Option 1:
Split the strain gauge's raw output signal, for example with a device like this. Splitted signal 1 goes to device X. Splitted signal 2 goes to my own device.

Option 2:
Get an external strain gauge amplifier, scale signal to 10 V, and split 10 V signal afterwards, as in option 1. The device X also has a +-10 V input, so no problem here.

I think option 2 is better. But I really want to understand HOW the strain gauge output is affected by splitting the signal as in option 1. I know that the splitter is pure analog, no A/D conversion is happening.
How does a splitter possibly work? Is it creating a parallel circuit? Then I assume that it would not increase the load on the strain gauge output, hence having no bad effect. But if the splitter would be somehow connected serially only, I think that the total resistance increases and I am going to measure a lower voltage in device X. Is it conceptually much different splitting a strain gauge signal in contrast to a potentiometer signal (for example from a travel sensor)? Could you please explain in detail?