Complex sentence: It was originally released in 1985 as the Sega Mark III in Japan and then redesigned and retitled the Master System for release in 1986 in North America, 1987 in Europe and Japan, and 1989 in Brazil.
Split into simpler sentences: It was originally released in 1985 as the Sega Mark III in Japan. After being redesigned prior to its North American launch, the console was renamed Master System and released in 1986 in North America, 1987 in Europe, and 1989 in Brazil.