Complex sentence: The 10.5 cm FlaK 38 was a German anti-aircraft gun used during World War II by the Luftwaffe as a competitor to the famed 8.8 cm FlaK 18.
Split into simpler sentences: The 10.5 cm FlaK 38 was a German anti-aircraft gun used during World War II by the Luftwaffe. The Flak 38 was introduced as a competitor to the famed 8.8 cm FlaK 18.