Complex sentence: Moreover, the South Korean Navy's position is that there is no problem carrying the rising sun flag by the Japan Maritime Self-Defense Force battleship and that it is an infringement of sovereignty if the Korean Navy requested to not carry the rising sun flag.
Split into simpler sentences: Moreover, the South Korean Navy's position is that there are no problems with the carrying of the rising sun flag by the Japan Maritime Self-Defense Force warships. It would be an infringement of sovereignty if the Korean Navy requested to not carry the rising sun flag.