Complex sentence: When equipped with the GPMG, the vehicle carries 1,600 rounds of belted 7.62mm ammunition; when carrying the Bren LMG, the vehicle carried 1,400 rounds of 7.62mm ammunition (50 magazines, each holding 28 rounds).
Split into simpler sentences: When equipped with the GPMG, the vehicle carries 1,600 rounds of belted 7.62mm ammunition. When carrying the Bren LMG, the vehicle has 1,400 rounds of 7.62mm ammunition (50 magazines, each holding 28 rounds).