Complex sentence: Both HMNZS "Otago" and HMNZS "Wellington" have recently gone through minor upgrades, including sensors and weapons, and replacing the 25mm Bushmaster with the Rafael Typhoon 25 mm stabilised naval gun.
Split into simpler sentences: Both HMNZS "Otago" and HMNZS "Wellington" have recently gone through minor upgrades, including sensors and weapons. Replacing the 25mm Bushmaster to the Rafael Typhoon 25 mm stabilised naval gun.