Complex sentence: The first unified command in the European area was established by the Joint Chiefs of Staff on 1 August 1952; the U.S. European Command (USEUCOM) was established to provide "unified command and authority" over all U.S. forces in Europe.
Split into simpler sentences: The first unified command in the European area was established by the Joint Chiefs of Staff on 1 August 1952. Designated the U.S. European Command (USEUCOM), it was established to provide "unified command and authority" over all U.S. forces in Europe.