Complex sentence: The MMPI-A normative sample included 805 males and 815 females, ages 14 to 18, recruited from eight schools across the United States and 420 males and 293 females ages 14 to 18 recruited from treatment facilities in Minneapolis, Minnesota.
Split into simpler sentences: The MMPI-A normative sample included 805 males and 815 females, ages 14 to 18, recruited from eight schools across the United States. The clinical sample included 420 males and 293 females ages 14 to 18 recruited from treatment facilities in Minneapolis, Minnesota.