Can you split amps?
You can definitely split to two amps but I'm not sure literally splitting the cable is enough or if you need to buy some sort of splitter box. Not only is it possible but many times there is no reason not to do it. The stereo effect it generates is really intoxicating.
Why do guitarists use 2 amps?
For Stereo Effects
Many players use two amps for stereo techniques that require multiple loudspeakers. ... Other stereo modulation effects, such as flangers and choruses, also make use of multiple speakers in a similar fashion.