Complex sentence: He would seem to disappear for several years and then suddenly return to performing; from late 1969 until 1975, he seemed to have abandoned music, and then suddenly reappeared playing clubs and released several new records from 1975 to 1978.
Split into simpler sentences: He would seem to disappear for several years and then suddenly return to performing. From late 1969 until 1975 he seemed to have abandoned music, and then suddenly reappeared playing clubs and released several new records from 1975 to 1978.