Complex sentence: The game was designed to relaunch the franchise for the seventh generation of video game consoles, and the team was initially led by "Sonic" co-creator Yuji Naka, but Naka resigned to form his own company, Prope.
Split into simpler sentences: The game was designed to relaunch the franchise for the seventh generation of video game consoles. The development team was initially led by "Sonic" co-creator Yuji Naka, but Naka resigned to form his own company, Prope.