Complex sentence: This was made possible by the fact that Russian 7.62 mm Model 1930 Type P cartridges were nearly identical to the German 7.63 × 25mm Mauser cartridge; therefore German ammunition could be used in captured Russian arms, and vice versa.
Split into simpler sentences: This was made possible by the fact that Russian 7.62 mm Model 1930 Type P cartridges were nearly identical to the German 7.63 × 25mm Mauser cartridge. Therefore German ammunition could be used in captured Russian arms, and vice versa.