Complex sentence: It is well known that according to the "special relativity", such communication would lead to the ability to send messages to one's own past, a technical development that would certainly change history (in more ways than one).
Split into simpler sentences: It is well known that according to the "special relativity", such communication would lead to the ability to send messages to one's own past. The ability to accomplish such a feat would certainly change history (in more ways than one).