In this task, we ask you to elaborate the sentence without changing its general meaning. You can do so by explaining further the input sentence, using more precise wording, adding qualifiers and auxiliary information etc.
Q: On 8th August 1967 , Malaysia , Thailand , Indonesia , Singapore , and the Philippines formed the ASEAN .
A: 
ASEAN itself was created on 8 August 1967 , when the foreign ministers of five countries : Indonesia , Malaysia , the Philippines , Singapore , and Thailand , signed the ASEAN Declaration .