Complex sentence: U- 488 was a "Milchkuh" ('Milk cow' or re-supply U-boat), such boats could re-supply multiple U-boats at sea, consequently'milk cows' were the prime target of Allied aircraft trying to disrupt U-boat activities.
Split into simpler sentences: U- 488 was a "Milchkuh" ('Milk cow' or re-supply U-boat). Consequently'milk cows' were the prime target of Allied aircraft trying to disrupt U-boat activities.