Original sentence: Political and trade relations with Japan have been a source of nationalist controversy in both Korea and Japan.Theory of a Japanese outpost is widely rejected even in Japan as there was no Japanese dynasty at the time which had a strong enough military power to conquer Gaya or any other part of Korea.While there is absolutely no evidence to support this widely rejected contention, the claim has nonetheless been advocated at various times by Japanese imperialists, nationalists and press to justify the Japanese invasion of Korea (1910–1945)
Edited sentence: However, this theory is widely rejected even in Japan as there was no Japanese dynasty at the time which had a strong enough military power to conquer Gaya or any other part of Korea.Political and trade relations with Japan are a matter of controversy.While there is absolutely no evidence to support this contention, it has nonetheless been advocated at various times by the Japanese press to justify the Japanese colonization of Korea (1910–1945)