Another option is a 'three way'
Not sure of the proper name for the PC signal splitter I have.
It has one male PC, so that a standard male to female cord from the camera fits that, and three females, so up to the flash haeds fits into them. I call it my sputnik, because it looks liked a little satellite with all the differnet connectors on this bit of plastic.
I use it for triggering my main and background light when doing portraits; the background light sits behind and under the posing stool, and the crumby slave I have for it is not always sensitive to fire when so shileded. On the third leg I connect up the bottom portion of an old dead cold shoe flashe that has a fashe test button on it. Pressing the button causes the flashes to fire without needing to unplug anything from the camera.
Someday I will have radio synched strobes trigger, but not while there are things like the kids swimming lessons, soccer league, etc. to pay for.