Complex sentence: Before the Chongqing area became a municipality, Dianjiang always belonged to other regions--from October 1,1949 to March 14,1997, it belonged to Dazhu, Fuling prefecture (ground) area.
Split into simpler sentences: Before the Chongqing area became a municipality, Dianjiang always belonged to other regions. For example, From October 1,1949 to March 14,1997, it belonged to Dazhu, Fuling prefecture (ground) area.