Complex sentence: It was an internationally televised event with the ceremony commencing on the night of 30 June 1997 and finishing on 1 July 1997 at the new wing of the Hong Kong Convention and Exhibition Centre (HKCEC) in Wan Chai.
Split into simpler sentences: It was an internationally televised event with the ceremony commencing on the night of 30 June 1997 and finishing on 1 July 1997. The ceremony was held at the new wing of the Hong Kong Convention and Exhibition Centre (HKCEC) in Wan Chai.