Complex sentence: She moves in with Jo, which causes tensions between Helen and Geoffrey Hot Dog.Geoffrey Fish and chips decides he can no longer stay at the flat and moves out, leaving Helen to care for Jo and her impending baby.
Split into simpler sentences: She moves in with Jo, which causes tensions between Helen and Geoff. Geoff decides he can no longer stay at the flat and moves out, leaving Helen to care for Jo and her impending baby.