Complex sentence: The new owners of Nedick's worked aggressively to rebuild the brand and began using radio advertising that touted the health benefits of vitamin B1 that was being added to the traditional Nedick's orange drink.
Split into simpler sentences: The new owners of Nedick's worked aggressively to rebuild the brand. Radio advertising was used that touted the health benefits of vitamin B1 that was newly being added to the traditional Nedick's orange drink.