Complex sentence: It was the subject of archeological digs by Susan and Roderick MacIntosh (and others) in the 1970s and has been dated to the 3rd century B.C., which is a fruit of a new, great investigation.
Split into simpler sentences: It was the subject of archeological digs by Susan and Roderick MacIntosh (and others) in the 1970s. It's been dated to BCE, which is a fruit of a new, great investigation.