Complex sentence: During this festival one of the symbolic celebrations is "Sangpangtu", where a big fire is lit and men and women sit around it putting on their complete best attire, the womenfolk serve the wine and meat.
Split into simpler sentences: During this festival one of the symbolic celebrations is Sangpangtu, where a big fire is lit and men and women sit around it. Men & women putting on the complete best attire and the womenfolk serve the wine and meat.