Complex sentence: Later on, per General Administration Department Notification No.F.20016/2/99 dated 3.6.1999 of the Govt. of Mizoram, Chhimtuipui West District was changed into Lawngtlai District and the Chhimtuipui East District was also changed into Saiha District.
Split into simpler sentences: Later on, as per General Administration Department Notification No.F.20016/2/99. Dated 3.6.1999 of the Govt. of Mizoram, Chhimtuipui West District was changed into Lawngtlai District and the Chhimtuipui East District was also changed into Saiha District.