When possible, use symmetry. Sofas should be placed such that they face each other. To finish the setup, place a coffee table in the center. Coffee tables can also be placed diagonally. Symmetry offers your living space a finished and organized appearance. Another option is to use dual entrance doors. This will allow people entering through one door to go directly into another without having to pass through the living room first. Make sure these doors are large enough for a person to walk through comfortably. A third option is using multiple rooms connected by a hallway. This would require a lot of work to create an appealing look but could be done. The advantage is that it allows people to enter different parts of the house without going through the main living area. Finally, you can use furniture to hide the fact that these are actually two separate rooms. For example, you can put a sofa in front of the double entrance door to make it look like there's only one way in/out. Or you can cover the window where the second entrance door leads to by placing a bookcase or antique cabinet next to it. These are just some ideas. You may want to consider other options before deciding what kind of arrangement will work best for you.