Complex sentence: Unlike most sitcoms of the era, "Good Morning, World" was filmed before a live audience; standard practice at the time was to film an episode on a closed set and add a laugh track during post-production.
Split into simpler sentences: Unlike most sitcoms of the era, "Good Morning, World" was filmed before a live audience. A standard practice at the time was to film an episode on a closed set and add a laugh track during post-production.