Complex sentence: Irma is the strongest hurricane ever recorded in the Atlantic basin outside the Caribbean and Gulf of Mexico, tied with the 1935 Labor Day hurricane as the strongest landfalling cyclone on record in the Atlantic basin, and the strongest tropical cyclone worldwide in 2017 so far.
Split into simpler sentences: Irma is the strongest hurricane ever recorded in the Atlantic basin outside the Caribbean and Gulf of Mexico, and is tied with the 1935 Labor Day hurricane as the strongest landfalling cyclone on record in the Atlantic basin. In addition, Irma is the strongest tropical cyclone worldwide in 2017 so far.