Complex sentence: Kumho Rent A Car currently operates over branch offices in Korea, including locations in Seoul, Incheon, Gyeonggi-do and other Korean locations, and is one of the largest vehicle rental agencies in the world.
Split into simpler sentences: Kumho Rent A Car has branch offices across Korea, including locations in Seoul, Incheon, Gyeonggi-do. It is one of the largest vehicle rental agencies in the world.