Complex sentence: In 1919, the United States Congress approved the construction of a submarine & destroyer base on Tongue Point, a peninsula jutting into the Columbia River after World War I with the military downsizing the base was never used.
Split into simpler sentences: In 1919, the United States Congress approved the construction of a submarine and destroyer base on Tongue Point, a peninsula jutting into the Columbia River. After World War I, with the military downsizing, the base was never used.