Original sentence: The Heinkel He 219 Uhu (Owl) was considered one of the best night fighters in the Luftwaffes inventory, yet not enough of them were built to stem the tide of bombers, which became effective at using strips of aluminium foil called "Window" (American name, chaff; German, Düppel) to jam the radar signals
Edited sentence: The Heinkel He 219 Uhu (Owl) was considered one of the best night fighters in the Luftwaffes inventory, yet thankfully for the Allies, not enough of them were built to stem the tide of bombers, which became effective at using strips of aluminium foil called "Window" (American name, chaff; German, Düppel) to jam the radar signals