Complex sentence: Park had established Oullim Networks Inc, a firm specializing in internet securities and Oullim Motors, a subsidiary of the Oullim conglomerate concentrating on the development, design and innovation of motor vehicles.
Split into simpler sentences: Park had established Oullim Networks Inc, a firm specializing in internet securities. He also founded Oullim Motors, a subsidiary of the Oullim conglomerate concentrating on the development, design and innovation of motor vehicles.