Complex sentence: Some other significant developments included the increase of the bombload by 30% to 4,000 lb (1,800 kg), and the ability to carry eight 5 in (127 mm) HVAR rockets under the wings.
Split into simpler sentences: Some other significant developments included the increase of the bombload by 30% to 4,000 lb (1,800 kg). Another development was the ability to carry eight 5 in (127 mm) HVAR rockets under the wings.