Complex sentence: This dramatic range increase has been driven by the development of rifled cannons, improvements in propellants, better communications and technical improvements in gunnery computational abilities, that have been ongoing since the end of the 19th Century.
Split into simpler sentences: This dramatic range increase has been driven by the development of rifled cannons, improvements in propellants, better communications and technical improvements in gunnery computational abilities. These technical developments have been ongoing since the end of the 19th Century.