Complex sentence: Their use on Korean pagodas began in the late Unified Silla period with about ten extant pieces such as the three story pagodas at Beomhak-ri, Sancheong, as well as the sites of Jinjeonsa and Seollimwon, Yangyang.
Split into simpler sentences: Their use on Korean pagodas began in the late Unified Silla period with about ten pieces still extant. This includes the three story pagodas at Beomhak-ri, Sancheong, as well as the sites of Jinjeonsa and Seollimwon, Yangyang.