Complex sentence: Jamsil stadium's "Exciting Zone" allows fans to see players close up, but as this zone is close to the playing field, audiences have to be cautious about safety and borrow a helmet.
Split into simpler sentences: Jamsil stadium's "Exciting Zone" has a merit in that audiences can see players close up. But as this zone is close to the playing field, audiences have to be cautious about safety and borrow a helmet.