Complex sentence: Gale warnings were prompted from Galveston, Texas, through Grand Isle, Louisiana, at 1800 GMT on August 28, and a flash flood watch was issued for the whole of Louisiana.
Split into simpler sentences: Gale warnings were prompted from Galveston, Texas, through Grand Isle, Louisiana, at 1800 GMT on August 28. In adition, a flash flood watch was issued for the whole of Louisiana.