This is the 4512th most frequent Turkish word.
açıklandıktan
"After being explained/announced."
In this sentence, 'açıklandıktan' is used as a temporal conjunction, indicating that the action of 'being announced' precedes the onset of public debates.
Yeni yasa açıklandıktan sonra halk arasında tartışmalar başladı.
After the new law was announced, debates began among the public.
Here, 'açıklandıktan' combines with 'itibaren' to specify the exact time after the details were provided for the action of ticket sales to begin.
Gösterinin detayları açıklandıktan itibaren biletler hızla tükendi.
From the moment the details of the show were announced, tickets sold out rapidly.
This usage of 'açıklandıktan' again serves to indicate the completion of the announcement action before the subsequent event of people expressing their thoughts.