Complex sentence: As of 2001 there were over 1,000 research studies regarding its efficacy, impact, and effect on American culture, and "Sesame Street" marked the first time research was used in the development of a children's television show.
Split into simpler sentences: As of 2001 there were over 1,000 research studies regarding the efficacy, impact, and effect of the children's television show "Sesame Street" on American culture. It marked the first time research was used in the development of a children's television show.