The Windows 10 shortcut to split windows is really useful: just press and hold the Windows key and then press either the Left or Right arrow key. This should automatically snap the active window to the left or right. Then you just select another window to fill the second empty space. Simple.
What is the shortcut to split your screen?
To use the keyboard shortcut, press and hold the Windows key followed by the Left or Right Arrow key to snap the active window to the left or right. Next, press and hold the Windows key followed by the Up or Down Arrow key to move the snapped window into the top or bottom corner.