Complex sentence: The standard 122 mm Howitzer shell weight of 21.8 kg was retained with metal cartridge cases and separate loading, and it appears that D-30 could fire the older M-30 ammunition.
Split into simpler sentences: The standard 122 mm Howitzer shell weight of 21.8 kg was retained with metal cartridge cases and separate loading. The D-30 could fire the older M-30 ammunition.