Complex sentence: On 3 and 4 July Dinahs flew over the Darwin area without being intercepted and a major raid was made against Fenton on 6 July by 26 bombers and 21 fighters.
Split into simpler sentences: On 3 and 4 July Dinahs flew over the Darwin area without being intercepted. These preceded a major raid against Fenton on 6 July by 26 bombers and 21 fighters.