Complex sentence: In Japan, the Mega Drive did not fare well against its two main competitors, Nintendo's Super Famicom and NEC's PC Engine, although it achieved considerable success in North America, Brazil, and Europe.
Split into simpler sentences: In Japan, the Mega Drive did not fare well against its two main competitors, Nintendo's Super Famicom and NEC's PC Engine. However, it achieved considerable success in North America, Brazil, and Europe.