Original sentence: Cytrel is a cellulose-based tobacco substitute used in some low-tar cigarette brands, famously comprising 25% of the Silk Cut brand.Development began on a replacement for tobacco in cigarettes in the 1950s, to reduce 'undesirable tobacco smoke components' present in cigarettes.However, the product was of a lower density than tobacco and useful as a bulking agent so development continued.It was one of the NSM (New Smoking Materials) that came into popularity in the 1970s
Edited sentence: Cytrel is a cellulose-based tobacco substitute used in some low tar cigarette brands.Development began for a replacement for tobacco in cigarettes began in the 1950s.Famously comprising of 25% of the Silk Cut brand.However, the product was of a lower density of tobacco and useful as a bulking agent so development continued.It was one of the NSW (New Smoking Materials) that came into popularity in the 1970s.The reason for this was to reduce 'undesirable tobacco smoke components' present in cigarettes (which also make the tobacco industry's claims later on very interesting)