Complex sentence: These three fractions are now considered the largest organized crime groups in South Korea, they are known as the "Seo-bang Fraction," the "Yang-eun Fraction" and the "OB Fraction" (Lee, 2006).
Split into simpler sentences: These three fractions are now considered the largest organized crime groups in South Korea. They are known as the "Seo-bang Fraction," the "Yang-eun Fraction" and the "OB Fraction" (Lee, 2006).