Complex sentence: The origins of communication theory is linked to the development of information theory, which landmark event is the publication of an article by Claude E. Shannon in the Bell System Technical Journal in July and October 1948 under the title' A Mathematical Theory of Communication.
Split into simpler sentences: The origins of communication theory is linked to the development of information theory. The main landmark event that opened the way to the development of communication theory was the publication of an article by Claude E. Shannon in the Bell System Technical Journal in July and October 1948 under the title' A Mathematical Theory of Communication.