Complex sentence: Gulrea-hyeon was called Hampyeong-hyeon in the Shilla Kingdom and in the Koryeo Kingdom, and now it covers Hampyeong-eub, Sonbul-myeon, Singwang-myeon, and Dadong-myeon.
Split into simpler sentences: Gulrea-hyeon was called Hampyeong-hyeon during the reign of the Silla Kingdom and in the Goryeo Kingdom. Today it covers Hampyeong-eub, Sonbul-myeon, Singwang-myeon, and Dadong-myeon.