Complex sentence: In the fall of 1971 the First Edition became hosts of their own television series that was taped in Canada called "Rollin' On the River", later to be shortened to "Rollin", was a variety show geared towards rock groups.
Split into simpler sentences: In the fall of 1971 the First Edition became hosts of their own television series that was taped in Canada called "Rollin' On the River". Later to be shortened to "Rollin", this was a variety show geared towards rock groups.