Original: Located in the Cologne/Bonn Region, about 20 kilometres south of Cologne on the river Rhine in the Federal State of North Rhine-Westphalia, it was the capital of West Germany from 1949 to 1990 and the official seat of government of united Germany from 1990 to 1999.
Simplified: Bonn was the capital of West Germany from 1949 until 1990 it.