Complex sentence: Gangchon is a tributary area that formed alongside the Bukhangang (북한강) flowing between the Samaksan (삼악산) and the Geombongsan (검봉산).
Split into simpler sentences: Gangchon is a tributary area formed alongside the Bukhangang (북한강). It flows between the Samaksan (삼악산) and the Geombongsan (검봉산).