Complex sentence: A modified version, Cordite MD, entered service in 1901, this increased guncotton to 65% and reduced nitro-glycerine to 30%, this change reduced the combustion temperature and hence erosion and barrel wear.
Split into simpler sentences: A modified version, Cordite MD, entered service in 1901, with the guncotton percentage increased to 65% and nitro-glycerine reduced to 30%. This change reduced the combustion temperature and hence erosion and barrel wear.