Complex sentence: Although noticeably better than in past years, an unpleasant odour still sometimes pervades the inner-CBD and "West End" residential areas-presumed to originate from the foul gas incinerators at the local Paper Mill. Locals refer to this as the "Traralgon stink".
Split into simpler sentences: Although noticeably better than in past years, an unpleasant odour still sometimes pervades the CBD and "West End" residential areas. It is presumed to originate from the gas incinerators at the local Paper Mill. Locals refer to this as the "Traralgon stink".