Complex sentence: No copy of the complete telecast is known to exist, although some excerpts (such as the announcers' pre-game comments on the field) were saved and are occasionally re-aired in retrospective features.
Split into simpler sentences: No copy of the complete telecast is known to exist. Some excerpts (such as the announcers' pre-game comments on the field) were saved and are occasionally re-aired in retrospective features.