Complex sentence: The "Land of the Lost" radio series--which aired from January 1944 to July 1948 & mdash, narrated by Hewson herself, was featured on the Mutual Broadcasting System and the American Broadcasting Company.
Split into simpler sentences: The "Land of the Lost" radio series--which aired from January 1944 to July 1948--was narrated by Hewson herself. It was featured on the Mutual Broadcasting System and the American Broadcasting Company.