ตำแหน่งใดที่แมตต์คลาร์กเล่นโดยรวมน้อยกว่า 421?
What position was less than 421 overall played by Matt Clark?
df = pd.DataFrame(columns=['position', 'overall', 'player'])
df[(df['overall'] < 421) & (df['player'] == 'matt clark')]['position']