Complex sentence: Harley Hartwell, known in Japan as, is Jimmy Kudo's rival detective from Osaka and his father, Martin Hartwell, known in Japan as, is the chief commissioner of the Osaka police department.
Split into simpler sentences: Harley Hartwell, known in Japan as, is Jimmy Kudo's rival detective from Osaka. His father Martin Hartwell, known in Japan as, is the chief commissioner of the Osaka police department.