Complex sentence: Headquartered in Helsinki, Finland, Sulake is in charge of the world's largest virtual world, Habbo and joined Sulake in the middle of their latest project, Bobba Bar, a virtual mini-world for iPhone, iPod Touch and Nokia phones.
Split into simpler sentences: Headquartered in Helsinki, Sulake is in charge of the world's largest virtual world, Habbo. He joined Sulake in the middle of their latest project, Bobba Bar, a virtual mini-world for iPhone, iPod Touch and Nokia phones.