Complex sentence: The Fw 190 made its air combat debut on the Eastern Front in November/December 1942; though Soviet pilots considered the Bf 109 the greater threat, the Fw 190 made a significant impact.
Split into simpler sentences: The Fw 190 made its air combat debut on the Eastern Front in November/December 1942. Though Soviet pilots considered the Bf 109 the greater threat, the Fw 190 made a significant impact.