Complex sentence: She took her first trip to the USA, where she accompanied her American friend, photographer Barbara Hamilton-Wright, by car along the eastern coast, up to Maine; into the Deep South; and to the coal basins of the industrial regions around Pittsburgh.
Split into simpler sentences: She took her first trip to the USA, where she accompanied her American friend, photographer Barbara Hamilton-Wright, by car along the eastern coast, as far as Maine. They then travelled into the Deep South and to the coal basins of the industrial regions around Pittsburgh.