Complex sentence: Since its premiere in 1969, it was the first preschool educational television program to base its contents, format, and production values on laboratory and formative research, and the first to include a curriculum "detailed or stated in terms of measurable outcomes".
Split into simpler sentences: Since its premiere in 1969, it was the first preschool educational television program to base its contents, format and production values on laboratory and formative research. It was also the first to include a curriculum "detailed or stated in terms of measurable outcomes".