Complex sentence: Torpedo nets were a passive naval warship defensive device against torpedoes, the use of which was common practice from the 1890s, continuing through World War I and World War II. Torpedo nets were superseded by the anti-torpedo bulge and torpedo belts.
Split into simpler sentences: Torpedo nets were a passive naval warship defensive device against torpedoes. Their use was common practice from the 1890s through World War II. Torpedo nets were superseded by the anti-torpedo bulge and torpedo belts.