Complex sentence: Late on September 18, while Gordon was beginning to accelerate to the northeast, a tropical storm watch was issued for all of the Azores, although the hurricane was expected to weaken to tropical storm-force before affecting the islands.
Split into simpler sentences: Late on September 18, while Gordon was beginning to accelerate to the northeast, a tropical storm watch was issued for all of the Azores. The hurricane was expected to weaken to tropical storm-force before affecting the islands.