Complex sentence: Radon is usually referred to as "Rodan" in the United States, possibly to avoid confusion with the atomic element Radon; any time his name is written in English in Japan, it is written as Rodan.
Split into simpler sentences: Radon is usually referred to as "Rodan" in the United States, possibly to avoid confusion with the atomic element Radon. Any time his name is written in English in Japan, it is written as Rodan.