Complex sentence: Until the Mauritian Ti Frère became popular in the 1960's, sega was only played in private places, particularly his performance at the Night of the Sega at Mount Le Morne on 30 October 1964.
Split into simpler sentences: Until the Mauritian Ti Frère became popular in the 1960's, sega was only played in private places. A particularly big turning point was his performance at the Night of the Sega at Mount Le Morne on 30 October 1964.