Complex sentence: It has 47 member countries, mostly located on the Asian and Australian continent but excluding all the transcontinental countries with territory in both Europe and Asia, which are are members of UEFA (Azerbaijan, Armenia, Georgia, Kazakhstan, Russia, and Turkey).
Split into simpler sentences: It has 47 member countries, mostly located on the Asian and Australian continent. All the transcontinental countries with territory in both Europe and Asia are members of UEFA (Azerbaijan, Armenia, Georgia, Kazakhstan, Russia, and Turkey).