Complex sentence: When Macau reverted from Portuguese administration to China in December, 1999, the future of Scouting in Macau seemed uncertain, but as a Special Administrative Region of the Peoples Republic of China, Macanese institutions are allowed to continue as before.
Split into simpler sentences: When Macau reverted from Portuguese administration to China in December, 1999. The future of Scouting in Macau seemed uncertain, but as a Special Administrative Region of the PRC, Macanese institutions are allowed to continue as before.