Complex sentence: The Etrich "Taube" (German, "dove") also called Rumpler "Taube" when built by Edmund Rumpler's firm, was a pre-World War I monoplane aircraft, and the first mass-produced military plane in Germany.
Split into simpler sentences: The Etrich "Taube" means (German, "dove") also called Rumpler "Taube". When built by Edmund Rumpler's firm, was a pre-World War I monoplane aircraft, and the first mass-produced military plane in Germany.