sentences:  To prepare for growth, the district constructed four new schools in the 1960s, thirteen in the 1970s, eleven in the 1980s, ten in the 1990s and nine more since 2000 as of 2020.In July 1976, the separate high school and elementary school districts combined to form the Paradise Valley Unified School District.In 1991, the 1930s Sunnyside campus, which had been expanded in the 1950s, was replaced with Greenway Middle School.