Complex sentence: Data from the Ministry of Education indicated that 60,000 Pakeha/NZ European students attended low-decile schools in 2000, but that number had halved by 2010, while high-decile schools had a corresponding increase in Pakeha students.
Split into simpler sentences: Data from the Ministry of Education found that 60,000 Pakeha/NZ European students attended low-decile schools in 2000, and had fallen to half that number in 2010. The same data also found that high-decile schools had a corresponding increase in Pakeha students.