Complex sentence: In October 1954, the administration of the CPC Yaxian Committee relocated from Yacheng to Sanya then in 1958, administration of Yaxian relocated from Yacheng to Sanya and Yaxian merged with Baoting, Lingshui, Niulou, and Xinglong, Wanning, to become a large county.
Split into simpler sentences: In October 1954, the administration of the CPC Yaxian Committee was relocated from Yacheng to Sanya. In 1958, Yaxian was relocated from Yacheng to Sanya and Yaxian was merged with Baoting, Lingshui, Niulou, and Xinglong of Wanning, thus becoming a large county.