Complex sentence: The name has ranked in the top 1,000 most popular names for girls in the United States since 1970, having last ranked among the top 1,000 names given to girls there between 1900 and 1910.
Split into simpler sentences: The name has ranked in the top 1,000 most popular names for girls in the United States since 1970. Prior to 1970, it had last ranked among the top 1,000 names given to girls in that country between 1900 and 1910.