Complex sentence: Hence Gaga and her team thought of building two stages, one main stage and an accompanying one on the far end of the arena, and a catwalk which would wind all around the floor, enabling the singer to interact with the audience.
Split into simpler sentences: Hence Gaga and her team thought of building two stages, one main stage and an accompanying one on the far end of the arena. It would be enhanced by the addition of a catwalk which would wind all around the arena floor, enabling the singer to interact with the audience.