Complex sentence: You go to lunch with Sonja LuAnn and Aviva but after you spill wine on yourself before Sonja arrives you rush home to change and by the time you get back Sonja is gone.
Split into simpler sentences: You go to lunch with Sonja, LuAnn and Aviva but afterward, you spill wine on yourself before Sonja arrives. You rush home to change and by the time you get back Sonja is gone.