Complex sentence: A number of short promotional Making-of videos have been released on ArkaMediaworks YouTube channel and the team unveiled first look posters and videos featuring the film's lead stars on the occasions of their birthdays.
Split into simpler sentences: A number of short promotional Making-of videos have been released. For releasing all those videos, Arka Media Works had its own channel on YouTube and the team unveiled first look posters and videos featuring the film's lead stars on the occasions of their birthdays.