Complex sentence: He then moved to Sant Feliu de Guíxols, on the Catalan coast, where he stayed from 1926 to 1928 and wrote "Dancing Catalans", a study of the significance of the Catalan national dance, the "sardana".
Split into simpler sentences: He then moved to Sant Feliu de Guíxols, on the Catalan coast, where he stayed from 1926 to 1928. During this time he wrote "Dancing Catalans", a study of the significance of the Catalan national dance, the "sardana".