Complex sentence: In 1971 the Scouts were renamed Union Defence Force (U.D.F.) upon the formation of United Arab Emirates (U.A.E.) and consisted of 2,500 regular military personnel.
Split into simpler sentences: In 1971 the Scouts were renamed Union Defence Force (U.D.F.) upon the formation of United Arab Emirates. At the time, the Force consisted of 2,500 regular military personnel.