Complex sentence: Presently, in the United Kingdom, Italy, Korea, and the United States both "obesity" and "overweight" are virtually stable, while in Australia, Canada, France, Mexico, Spain, and Switzerland these have increased.
Split into simpler sentences: Presently, in countries like England, Italy, Korea, and the United States both "obesity" as well as "overweight" are virtually stable. Alternatively, in countries like Australia, Canada, France, Mexico, Spain, and Switzerland these have increased.