Complex sentence: Demolition of the Walled City began on 23 March 1993 and concluded in April 1994, and construction work on Kowloon Walled City Park started the following month.
Split into simpler sentences: Demolition of the Walled City began on 23 March 1993. The Walled City's demolition was finished in April 1994, and construction work on Kowloon Walled City Park started the following month.