Complex sentence: He is one of the most liberal white Democrats from a Southern district, and one of the most liberal congressmen ever to represent Texas in Congress and has been described as a strong voice for his party on taxes and environmental policies.
Split into simpler sentences: He is one of the most liberal white Democrats from a Southern district, and one of the most liberal congressmen ever to represent Texas in Congress. He has been described as a strong voice for his party on taxes and environmental policies.