Complex sentence: Struck in the early hours of September 13,2007, it had formed in the northwestern Gulf of Mexico and intensified faster than any other tropical cyclone on record before making landfall at High Island, Texas.
Split into simpler sentences: Struck in the early hours of September 13,2007. It formed in the northwestern Gulf of Mexico and intensified faster than any other tropical cyclone on record before making landfall at High Island, Texas.