Complex sentence: Sega Rosso is the name of a former development studio from Sega, formerly known as AM5, some of its staff came from Namco, where they helped create the original Ridge Racer.
Split into simpler sentences: Sega Rosso is the name of a former development studio from Sega, formerly known as AM5. Some of its staff came from Namco, where they helped create the original Ridge Racer.