Complex sentence: During lunch, the "left-siders" pester Robert about the list, who, in-between beers, informs them that the left-siders are "winners" while the right side are "losers".
Split into simpler sentences: During lunch, the "left-siders" pester Robert about the list. Slightly intoxicated, Robert informs them that the left-siders are "winners" while the right side are "losers".