Complex sentence: The future of the race has been questioned due to the possibility of heightened environmental restrictions in the protected Wadden Sea area, however, due to diligent management of the race this is not an issue at this time.
Split into simpler sentences: The future of the race has been questioned due to the possibility of heightened environmental restrictions in the protected Wadden Sea area. However, due to diligent management of the race this is not an issue at this time.